If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 an... — Answer & Explanation | PrepBeePakistan

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HomeMCQsChemical Engineering

MEDIUMENGLISHChemical Engineering

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?

Correct answer: A

Explanation

The change in enthalpy (ΔH) is calculated by summing the heats of formation: ΔH = H(C3H8) - [H(CH4) + H(C2H4)] = (-24.8) - [-17.9 + 12.5] = -24.8 - (-5.4) = -19.4 kcal.

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