If heat contents of CH₄, C₂H₄ and C₃H₈ are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH₄(g) + C₂H₄(g) ⇋ C₃H₈(g) will be __________ Kcal.

A) -19.4 B) -30.2 C) 55.2 D) -55.2

Answer & Solution

Correct Answer: Option A

Since the enthalpy change $$=$$ enthalpy or heat content of the products $$–$$ enthalpy or heat content of the reactants $$= -24.8+17.9-12.5 = -19.4.$$

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If heat contents of CH₄, C₂H₄ and C₃H₈ are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH₄(g) + C₂H₄(g) ⇋ C₃H₈(g) will be __________ Kcal.