Answer Modul Nilam Chemistry Form 5 Free [patched] Online

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• Question: Given ΔHf of CO2 = -394 kJ/mol and ΔHf of H2O = -286 kJ/mol, calculate ΔHc for C2H5OH.
• Free Answer: -1368 kJ/mol.
• Why? Use the formula: ΔHc = ΣΔHf(products) – ΣΔHf(reactants). C2H5OH + 3O2 → 2CO2 + 3H2O. Calculation: [2(-394) + 3(-286)] – [1(-277) + 0] = -1368.