Question

How to find heat of combustion when heat of formation is given?

Answer 1

Answer:

Explanation:

Calculate the heat of combustion of ethyne, as described in the equation C2H2(g) + 2½O2(g) → 2CO2(g) + H2O(l), given the heats of formation of ethyne gas, carbon dioxide gas and water liquid are +227 kJ mol-1, -393.5 kJ mol-1 and –285.8 kJ mol-1 respectively. Answer: C2H2(g) + 2½O2(g) → 2CO2(g) + H2O(l) ΔHc = ?

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