ThermochemistryHard

Question

If DfHo (C2H4) and ᐃfHo (C2H6) are x1 and x2 kcal mol-1, then heat of hydrogenation of C2H4 is :

Options

A.x1 + x2
B.x1 - x2
C.x2 - x1
D.x1 + 2x2

Solution

C2H4(g)  + H2 (g) → C2H6 (g)
ᐃHo = ᐃHfo (C2H6, g) - ᐃHfo (C2H4, g)  = x2 - x1

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