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The heat of combustion of C2H6 is -368.4 kcal. Calculate heat of combustion of C2H4, heat of combustion of H2 is 68.32 kcal mol-1

C2H4(g) + H2(g) → C2H6(g) ; ΔH = -37.1 kcl

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C2H4(g) + H2(g) → C2H6(g); ΔH = -37.1 k cal. 

ΔHcC2H6 = -368.4 k cal, ΔHcC2H2 = ?; 

ΔHcH2(g) = -68.32 k cal. 

ΔH = ΣΔHc(reactanta) – ΣΔHc(products) 

ΔH = ΔHcC2H4 + ΔHcH2(g) – ΔHcC2H6(c) 

-37.1k cal = ΔHcC2H4 -68.32-(-368.4) 

ΔHcC2H6 = -337.18 kcal.

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