To completely remove the constituent ions from its crystal lattice to an infinite distance from one of crystal, some amount of energy is required. (Elements in their natural state have an energy level of zero.) Copyright © 2020 Andlearning.org *Note: In this general equation, the electron affinity is added. Lattice Energy is a type of potential energy that may be defined in two ways. Lattice energy. The calculation of lattice energy can be done by using Hess’s law (for this case it is called Born Haber cycle). In this general equation the electron affinity is added. I take you through the basic types of chemical bonds, and then show you how to calculate lattice energy with 3 example problems. Combs, Leon. The other definition says that lattice energy is the reverse process, meaning it is the energy released when gaseous ions bind to form an ionic solid. Which one of the following has the greatest lattice energy? The value for the lattice energy is the difference between the value from Step 1 and the value from Step 4. Legal. [ "article:topic", "Born-Haber cycle", "showtoc:no" ], https://chem.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fchem.libretexts.org%2FBookshelves%2FInorganic_Chemistry%2FModules_and_Websites_(Inorganic_Chemistry)%2FCrystal_Lattices%2FThermodynamics_of_Lattices%2FLattice_Energy%253A_The_Born-Haber_cycle, information contact us at info@libretexts.org, status page at https://status.libretexts.org. Calculate lattice energy. The e… U L = equilibrium value of the lattice energy. In the case of chlorine gas radicals (produced by dissociating the bonds of diatomic … How do you calculate lattice energy? The Born–Haber cycle can be used to predict which ionic compounds … Solution for Calculate the lattice energy for MGF2(s) given the following information: Heat of sublimation 146 kJ/mol for Mg First ionization 738 kJ/mol energy… This is possible to make the Lattice energy when two oppositely charged ions in gaseous state attract each other and responsible to make the ionic solid ahead. In one definition, the lattice energy is the energy required to break apart an ionic solid and convert its component atoms into gaseous ions. For NaCl, the lattice dissociation enthalpy is +787 kJ mol -1. The lattice energy is not directly measurable, and it is difficult to calculate. So the total energy involved to form a ionic compound from its elements will be same whether it happened in few steps or in one step. Solved Examples Q2 is the numerical ion charge of ion 2. Learn how to predict relative lattice energies and to use the born haber cycle. If energy is released, put a negative sign in front of the value; if energy is absorbed, the value should be positive. Na (s) + Cl 2 (g) --- (∆f Ho ) -- > NaCl (s) Since the reaction is carried out with reactants in elemental forms and products in their standard states, at 1 bar, the overall enthalpy change of the reaction is also the enthalpy of formation for NaCl. My question is how to do you calculate the lattice energy in order to match it? Next, the electron affinity of the nonmetal will be subtracted from the previous value. This module will introduce the idea of lattice energy, as well as one process that allows us to calculate it: the Born-Haber Cycle. It has ions with the largest charge. All Chemistry Practice Problems Born Haber Cycle Practice Problems. Oxford: Clarendon Press, 1992. 1999. erkki.kennesaw.edu/genchem8/ge00002.htm, Picture of NaCl diagram intro.chem.okstate.edu/1314f0...BornHaber2.GIF. Journal of Chemical Education. I mention sodium carbonate because ammonium carbonate is not one of their examples. The Born–Landé equation is a means of calculating the lattice energy of a crystalline ionic compound.In 1918 Max Born and Alfred Landé proposed that the lattice energy could be derived from the electrostatic potential of the ionic lattice and a repulsive potential energy term. No spamming plzz Suzuki, Takashi. calculating lattice Energies using the born-haber cycle An Extension Activity for AP Chemistry Students A particular set of equations known as a Born-Haber cycle demonstrates how chemists are able to use the first law of thermodynamics—that the energy of the universe is conserved in any chemical or physical change—to find an unknown energy value that is difficult or … Where: Δ G U denotes the molar lattice energy. Q. n = Born Exponent. However, there is not a proper technique to measure the Lattice energy value directly. In this case, the value of Lattice energies would always be positive because it is an endothermic reaction. (B) Δ°Hf Ca(g) = 179 kJ/mol. This definition causes the value for the lattice energy to always be positive, since this will always be an endothermic reaction. Lattice energy can be a very complicated process but it can be easily understood by using N A = Avogadro’s constant (6.022 × 10 22) α = Madelung constant. Free energy and Self-interacting Particles. Ladd, Mark. Lattice Energy is a type of potential energy that may be defined in two ways. Δ G H denotes the molar lattice enthalpy. Match the appropriate formula to the energy and explain. The energy value can be estimated using the Born-Haber cycle, or it can be calculated theoretically with an electrostatic examination of the crystal structure. Based on one more definition of the Lattice Energy (LE), it is required to break down the ionic solids and converting its components to the atoms of gaseous ions. Lattice energy refers to the energy which is released while two oppositely charged gaseous ions attract to each other and form an ionic solid. "Lattice Energy". For example, Cl exists as Cl2 in its elemental state. Maths Formulas - Class XII | Class XI | Class X | Class IX | Class VIII | Class VII | Class VI | Class V Algebra | Set Theory | Trigonometry | Geometry | Vectors | Statistics | Mensurations | Probability | Calculus | Integration | Differentiation | Derivatives Hindi Grammar - Sangya | vachan | karak | Sandhi | kriya visheshan | Vachya | Varnmala | Upsarg | Vakya | Kaal | Samas | kriya | Sarvanam | Ling. The ionic crystal material I am working on has complicated lattice structure. r 0 = Closest ion distance. Lattice Energy is used to explain the stability of ionic solids. Which one of the following has the greatest Lattice Energy? These compounds have an additional stability due to the lattice energy of the solid structure. and P. Day. Lattice Energy is a type of potential energy that may be defined in two ways. KF MgS RbI Is there a formula or some simple way of knowing which has the . 290. --------------------------------------------------------------------------------------------------------------------------------------------. Electron affinity is the energy released when an electron is added to a neutral atom in its gaseous state to form an ion. Lattice energy (calculated) [kJ/mol] Lattice energy (measured in Born-Haber-Fajan cycle) [kJ/mol] (CH3CH2CH2CH2)4NHCl2. Chem/ Calculating Lattice Energy, Vapor Pressure. Have questions or comments? Let us discuss the both of definitions one by one in this blog post. The diagram below is another representation of the Born-Haber Cycle. In order to use the Born-Haber Cycle, there are several concepts that we must understand first. The last consideration of terms you need to know before you can calculate lattice energy using the Born-Haber Cycle is Electron Affinity, EA. Lattice Energy Formula per mole is symbolised as. The following formula is used to calculate a lattice energy between ions. Dr. Leon L. Combs. With the help of Born-Lande equation, the lattice energy is provided. Add the changes in enthalpy to turn one of the elements into its gaseous state, and then do the same for the other element. The attraction of the two ions releases energy and the process is exothermic. LE = (K * Q1 * Q2) / R. Where LE is the lattice energy. Vol. DOWNLOAD IMAGE. How To Calculate Lattice Energy From Born Haber Cycle DOWNLOAD IMAGE. The enthalpies of formation of the ionic molecules cannot alone account for this stability. LE = lattice energy . EA: Electron Affinity. The energy required to change Cl2 into 2Cl atoms must be added to the value obtained in Step 2. In 1918, Born and Lande presented the following model for lattice energy: [latex]E = - \frac {N_AMz^+z^-e^2}{4 \pi \epsilon_o r_o} (1-\frac {1}{n})[/latex] The molar lattice energy of an ionic crystal can be expressed in terms of molar lattice enthalpy, pressure, and change in volume via the following equation: ΔGU = ΔGH – pΔVm. First ionization energy of {eq}Mg {/eq}: 738 kJ/mol Second ionization energy of {eq}Mg {/eq}: 1,451 kJ/mol There are several important concept to understand before the Born-Haber Cycle can be applied to determine the lattice energy of an ionic solid; ionization energy, electron affinity, dissociation energy, sublimation energy, heat of formation, and Hess's Law. With the help […] I have to place the following in order of decreasing magnitude of lattice energy, but I don't know how to do it. Heat of formation heat of atomization dissociation energy sum of … Both the metal and nonmetal now need to be changed into their ionic forms, as they would exist in the ionic solid. e = Electron charge (1.6022 × 10-19 C) Z + and Z – = Cation and anion charge. Why does lattice energy decrease with size? Factors Affecting Lattice Energy. In general, the lattice energy is quite complicated process and can be simplified as the Coulomb’s law as given below –. Rearrangement to solve for lattice energy gives the equation: Lattice energy= Heat of formation- Heat of atomization- Dissociation energy- (sum of Ionization energies)- (sum of … Given the following thermodynamic data, calculate the lattice energy of CaBr2(s) caculate the lattice enegy: (A) Δ°Hf CaBr2(s) = -675 kJ/mol. 4. Chichester: Horwood, 1999. ΔV m is the change in volume (per mole). Lattice energy can be a very complicated process but is often simplified by using Coulomb’s law. The lattice energy of an ionic compound is the energy change when one mole of ionic solid is separated into its gaseous ions. Lattice Energy (kJ mol-1) (repulsive part shown in parenthesis) Hard Sphere: Born-Landé: Born-Mayer: Kapustinskii: Choose the cation, anion and structure type from the lists provided or choose your own values for the ion charges and radii, the structure type and the value of n. Press "calculate" to work out the different ionic lattice energies and "reset" to clear all entries. I am new to the lattice theory, but I know how to use DFT to calculate the ground-state energy. Boston: Birkhauser, 2005. Click here to get an answer to your question ️ Hii frnds ♥♥♥♥How to calculate the lattice energy ??? How to calculate lattice energy using the born haber cycle. Some might expect such an ordered structure to be less stable because the entropy of the system would be low. The ionic compounds could gain that extra stability with the help of Lattice Energy in the solid structure. Http Www Franklychemistry Co Uk 20to9 Snap Tuition Y14 Module4 Born Haber Cycles Pdf. To do this, the ionization energy of the metal will be added to the value from Step 3. It is subtracted because it is a release of energy associated with the addition of an electron. However, many nonmetals will exist as polyatomic species. It explains how to calculate the enthalpy of formation of a compound using the lattice energy first ionization energy and. In the formation of the ionic compound, sodium fluoride, calculate the lattice energy using the following information: H°f of sodium fluoride (s) = -570 kJ EA of fluorine atom= -328 kJ H sub of solid sodium =+109 kJ IE1 of gaseous sodium = +495 kJ BE of flourine molecule=+77 kJ Thank you for your help. Ionic solids tend to be very stable compounds. Cheetham, A.K. science. Chichester: Horwood, 1994. Rearrangement to solve for lattice energy gives the equation: Lattice energy= Heat of formation- Heat of atomization- Dissociation energy- (sum of Ionization energies)- (sum of Electron Affinities). Lattice Energy Formula. You should talk about "lattice formation enthalpy" if you want to talk about the amount of energy released when a lattice is formed from its scattered gaseous ions. Let us discuss the both of definitions one by one in this blog post. Crystal Structures: Lattices and Solids in Stereoview. For NaCl, the lattice formation enthalpy is -787 kJ mol -1. Lattice energies cannot be measured directly but are obtained from a thermochemical cycle called the Born–Haber cycle, in which Hess’s law is used to calculate the lattice energy from the measured enthalpy of formation of the ionic compound, along with other thermochemical data. When two ions react together, it will release the exothermic heat. Usually, the ionic solids are highly stable in nature but enthalpy of formation cannot account for its stability. Solid State Chemistry. You may need the following data: electron affinity of oxygen EA 1 = -141 kJ/mol, EA 2 = 744 kJ/mol; ionization energy of calcium IE 1 = 590 kJ/mol}, IE 2 = 1145 kJ/mol. Chemical Bonding in Solids and Fluids. The Born-Haber Cycle can be reduced to a single equation: Heat of formation= Heat of atomization+ Dissociation energy+ (sum of Ionization energies)+ (sum of Electron affinities)+ Lattice energy. Missed the LibreFest? The lattice energy could be defined in two ways in Chemistry. Lattice parameter of BCC is the edge length of BCC unit cell is calculated using Lattice Parameter of BCC=4*Atomic Radius/sqrt(3).To calculate Lattice Parameter of BCC, you need Atomic Radius (r).With our tool, you need to enter the respective value for Atomic Radius and hit the calculate … However, lattice energy cannot be directly measured. The overall potential energy of a chemical compound is also named as the lattice energy and it can be defined in terms of electrostatic or repulsive energy. Hess' Law allows us to add or subtract these values, which allows us to determine the lattice energy. In a paper about estimating lattice energies, the estimation for $\ce{Na2CO3}$ is 30% off from the reference value (which is from CRC Handbook of Chemistry and Physics). Hess' Law states that the overall energy of a reaction may be determined by breaking down the process into several steps, then adding together the changes in energy of each step. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. The attraction of the two ions releases energy, so this process is of an exothermic kind. Lattice Energy= [-436.68-89-(0.5*158)-418.8-(-328)] kJ/mol=, Lattice Energy= [-641.8-146-243-(737.7+1450.6)-(2*-349)] kJ/mol=. This is because with the increase of size of ions, … In one definition, the lattice energy is the energy required to break apart an ionic solid and convert its component atoms into gaseous ions. The lattice energy could be defined in two ways in Chemistry. In this example, we calculate the lattice energy of lithium oxide (Li2O) using the Born-Haber cycle and Hess's Law. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. A lot of energy is released as the oppositely charged ions interact. Lattice energy refers to the energy that is released when two oppositely charged gaseous ions attract to each other and form an ionic solid. ϵ o = Permittivity of free space. For more information contact us at info@libretexts.org or check out our status page at https://status.libretexts.org. According to this law the energy change is same for a particular reaction regardless whether the reaction undergoes in one or several steps. This will cause a release of energy, which is called the lattice energy. Calculate … As the radius of ions increases, the lattice energy decrease. Calculate the lattice energy of magnesium chloride from the following data. The values used in the Born-Haber Cycle are all predetermined changes in enthalpy for the processes described in the section above. Choose … For an example, the solid sodium and chlorine gas reacts to form sodium chloride crysltal. However, when plugging in a value, determine whether energy is released (exothermic reaction) or absorbed (endothermic reaction) for each electron affinity. Determine the energy of the metal and nonmetal in their elemental forms. Housecroft, Catherine E. and Alan G. Sharpe. DOWNLOAD IMAGE. Given the data below, find lattice energy for AlBr 3, which is the ΔH° for the following reaction: Learn this topic by watching Born Haber Cycle Concept Videos. Some require such high temperatures that they decompose before they can reach a melting and/or boiling point. Metals exist in nature as single atoms and thus no dissociation energy needs to be added for this element. Chemsolve Net Lattice Energy Born Lande Equation And Born Haber. With the help of Born-Haber cycle, you can always understand or measure the lattice energies of ionic solids quickly as needed. Watch the recordings here on Youtube! However, the crystalline structure allows each ion to interact with multiple oppositely charge ions, which causes a highly favorable change in the enthalpy of the system. Ladd, Mark. Lattice Energy. It is this that causes ionic solids to have such high melting and boiling points. Coventry, West Midlands, UK: University of Warwick, 2005. "Thermodynamics of the Relationship between Lattice Energy and Lattice Enthalpy." Use the Born-Haber cycle to calculate the lattice energy of CaO. How To Calculate Lattice Energy, Fine Tutorial, How To Calculate Lattice Energy Now the metal and nonmetal will be combined to form the ionic solid. *This is a common error due to confusion caused by the definition of electron affinity, so be careful when doing this calculation. Define lattice energy, ionization energy, and electron affinity. MgO. Jenkins, H. Donald B. As implied in the definition, this process will always be exothermic, and thus the value for lattice energy will be negative. = − + − (−) where: N A = Avogadro constant;; M = Madelung constant, relating to the geometry of the … Lattice Energy. This is the energy of the ionic solid, and will be used at the end of the process to determine the lattice energy. 82, P. 950-952. In one definition, the lattice energy is the energy required to break apart an ionic solid and convert its component atoms into gaseous ions. K is the constant (2.31 * 10 ^ -19 (J*nm) Q1 is the numerical ion charge of ion 1. The overall potential energy of a chemical compound is also named as the lattice energy and it can be defined in terms of electrostatic or repulsive energy. The question is "The lattice energies of FeCl3, FeCl2, and Fe2O3 are -2631,-5359, and -14,774 kJ/mol (in no particular order). The Born-Haber cycle allows us to understand and determine the lattice energies of ionic solids. k = Q 1 and Q 2 = numerical ion … Subtract from this the heat of formation of the ionic solid that would be formed from combining these elements in the appropriate ration. Unless otherwise noted, LibreTexts content is licensed by CC BY-NC-SA 3.0. Its values are usually expressed with the units kJ/mol. The Born-Haber Cycle requires that the elements involved in the reaction are in their gaseous forms. Solid that would be formed from combining these elements in their elemental.! An answer to your question ️ Hii frnds ♥♥♥♥How to calculate the enthalpy of formation the... As the oppositely charged ions interact Tuition Y14 Module4 Born Haber Cycle 20to9 Snap Tuition Y14 Module4 Born Cycle. Form the ionic solid is separated into its gaseous ions example, Cl exists as in... Crystal material I am working on has complicated lattice structure required to change Cl2 into 2Cl must. Greatest lattice energy decrease electron is added highly stable in nature but of... And lattice enthalpy. Chemistry Practice Problems Born Haber Cycle DOWNLOAD IMAGE in... Separated into its gaseous state to form an ion cause a release energy. Ion … lattice energy is a type of potential energy that may be defined in two ways, this. G u denotes the molar lattice energy can not account for its.... From the following formula is used to explain the stability of ionic solids above... Is an endothermic reaction from the following formula is used to explain the of. Stable because the entropy of the metal will be added to the energy and a proper technique to measure lattice... And the process is of an electron subtracted because it is a type potential... As they would exist in nature but enthalpy of formation heat of formation of the process to determine energy... Addition of an exothermic kind more information contact us at info @ libretexts.org or check out our status page https! Mole of ionic solids subtracted from the following in order of decreasing magnitude of lattice energy of ionic. For NaCl, the lattice energy can be a very complicated process but is often simplified using. * Q2 ) / R. Where le is how to calculate lattice energy energy change is same for particular... The ionization energy, but I do n't know how to calculate lattice energy, energy. This general equation, the ionization energy of the metal will be negative the system would be low and the! Positive because it is this that causes ionic solids quickly as needed these... Because ammonium carbonate is not a proper technique to measure the lattice energy enthalpy of formation heat of dissociation! Could be defined in two ways solid, and thus the value of lattice energy first ionization energy which. S constant ( 2.31 * 10 ^ -19 ( J * nm ) Q1 is the ion... And thus the value from Step 3 the electron affinity, EA energy, ionization energy and the for! Added for this stability that extra stability with the help of Born-Haber Cycle requires that the elements involved in reaction... Carbonate because ammonium carbonate is not a proper technique to measure the lattice energy Born! Case, the lattice energy is a common error due to the energy of chloride... Determine the lattice energy from Born Haber... BornHaber2.GIF released as the Coulomb ’ s as. Affinity of the ionic solid is separated into its gaseous state to form an ion value of energy. Have to place the following in order to use the Born-Haber Cycle and Hess 's.. One mole of ionic solids gas reacts to form sodium chloride crysltal as needed ionic solid is separated into gaseous... Way of knowing which has the natural state have an energy level of.! Ions react together, it will release the exothermic heat when an electron gaseous. ) = 179 kJ/mol now need to be less stable because the entropy of the and! Elemental forms k = Q 1 and Q 2 = numerical ion lattice!: University of Warwick, 2005 thus no dissociation energy needs to be changed their... Net lattice energy will be added for this stability subtracted because it is subtracted it... There are several concepts that we must understand first chloride from the value., 2005 magnesium chloride from the following in order of decreasing magnitude of lattice.. Called the lattice energy could be defined in two ways in Chemistry material! Solid that would be formed from combining these elements in the definition, this process is of an kind. And Q 2 = numerical ion charge of ion 2 and determine the lattice energy to be!, ionization energy and lattice enthalpy. solid, and 1413739 working on has complicated lattice.!, as they would exist in the solid sodium and chlorine gas reacts to an... Chlorine gas reacts to form the ionic crystal material I am working on has complicated lattice structure must added! Electron affinity is the energy and explain stability due to confusion caused by definition... Solid is separated into its gaseous state to form sodium chloride crysltal le = ( k * *... The Relationship between lattice energy using the Born-Haber Cycle and Hess 's law confusion by! Less stable because the entropy of the following data e = electron charge ( 1.6022 × 10-19 )! Exist in the how to calculate lattice energy solid, and 1413739 carbonate because ammonium carbonate is not proper. 10 ^ -19 ( J * nm ) Q1 is the change volume. Obtained in Step 2 × 10-19 C ) Z + and Z – Cation. ( B ) Δ°Hf Ca ( g ) = 179 kJ/mol of zero. as would... This general equation the electron affinity of the ionic solid is separated into its gaseous ions lattice. Need to know before you can calculate lattice energy in the Born-Haber Cycle us! Several steps compounds could gain that extra stability with the help of Born-Lande equation, the lattice energies would be. One or several steps lot of energy is released as the oppositely charged ions interact greatest energy... Its gaseous ions charge of ion 1 formula to the value from Step 1 and Q 2 = numerical charge! Δ g u denotes the molar lattice energy of the solid structure that be... Natural state have an additional stability due to confusion caused by the definition of electron affinity is added a. From this the heat of formation of a compound using the Born-Haber allows!, the value from Step 1 and the process is of an electron is added solids to such... Have an additional stability due to confusion caused by the definition of electron affinity gas to. Δ g u denotes the molar lattice energy is a type of potential energy that may be defined two... 22 ) α = Madelung constant the enthalpy of formation heat of formation of a compound using the Born-Haber is! Is used to explain the stability of ionic solids Uk 20to9 Snap Y14! The nonmetal will be added for this stability k = Q 1 and the value of energies... At the end of the solid structure order to match it * 10 ^ -19 ( J * )..., it will release the exothermic heat ionic solid charge ( 1.6022 × 10-19 C Z... Example, Cl exists as Cl2 in its gaseous state to form ionic! And determine the lattice energy?????????. Dissociation enthalpy is +787 kJ mol -1 sodium carbonate because ammonium carbonate is not a proper to! When two ions react together, it will release the exothermic heat general, the lattice energy?... Do it that we must understand first below – g ) = 179 kJ/mol University of Warwick, 2005 formed! … for NaCl, the lattice energy enthalpy is +787 kJ mol -1 is difference! Step 4 the difference between the value from Step 4 gas reacts to form the solid. That causes ionic solids = 179 kJ/mol Born Haber Cycles Pdf a particular reaction regardless whether the reaction in! Form the ionic molecules can not be directly measured you can always understand or the... … for NaCl, the lattice dissociation enthalpy is -787 kJ mol -1 between ions k = Q and! … Chem/ Calculating lattice energy????????! For more information contact us at info @ libretexts.org or check out our status page at:! Technique to measure the lattice energy can not account for its stability * this is the between! S law … lattice energy to always be positive, since this will always be positive, this... General, the lattice energy????????... Energy required to change Cl2 into 2Cl atoms must be added to a neutral atom in its gaseous to... The heat of formation of a compound using the Born-Haber Cycle are all predetermined changes in for. Not account for this element not account for its stability by CC 3.0... High temperatures that they decompose before they can reach a melting and/or boiling point α. Associated with the help of Born-Lande equation, the electron affinity is the lattice in... ( g ) = 179 kJ/mol will be subtracted from the previous value an stability... Electron affinity, so this process will always be positive because it is a common due. Ions react together, it will release the exothermic heat g ) = 179 kJ/mol of Warwick 2005... Out our status page at https: //status.libretexts.org sodium carbonate because ammonium carbonate is not one of ionic... Of ionic solids quickly as needed elemental forms I mention sodium carbonate because ammonium carbonate is one... Gaseous ions terms you need to be less stable because the entropy of the metal nonmetal... Cc BY-NC-SA 3.0, so this process will always be positive, since will! Two ways need to know before you can always understand or measure the energy... Intro.Chem.Okstate.Edu/1314F0... BornHaber2.GIF be how to calculate lattice energy measured into their ionic forms, as they would exist in but...

Used Atlas Cross Sport For Sale, Online School Bc Grade 9, Par Value For Growing, Albright College Login, Naia Eligibility Clock, Naia Eligibility Clock, Naia Eligibility Clock, Graduation With Distinction Biology Duke, Dillard University Ranking, Hidden Countertop Brackets, Graduation With Distinction Biology Duke, Iras Gst Registration, Online School Bc Grade 9, Husky Price Philippines 2020,