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Question
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.
Options:
A .  -19.4
B .  55.2
C .  -30.2
D .  -55.2
Answer: Option A

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