Stpm Chemistry Sem 2 Past Year Papers Answers 2020 !link!

To maximize your score, you must understand the weighting of the paper. The STPM Chemistry Sem 2 code is .

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Given enthalpy data for MgO: ΔHf°(MgO) = -602 kJ/mol 1st IE of Mg = +738 kJ/mol 2nd IE of Mg = +1451 kJ/mol Bond energy of O₂ = +498 kJ/mol Electron affinity of O (1st EA) = -142 kJ/mol Electron affinity of O (2nd EA) = +844 kJ/mol ΔHatomization of Mg = +148 kJ/mol Calculate the lattice energy of MgO. To maximize your score, you must understand the

This is a classic buffer calculation. You can use the Henderson-Hasselbalch equation or the equilibrium expression. To maximize your score

From analyzing marking schemes, these errors cost many students: