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

A. 55.2

B. -55.2

C. -30.2

D. -19.4
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