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Question

If H2S+32O2H2O+SO2,
ΔH=136.7Kcal
H2+12O2H2O,ΔH=68.4Kcal
S+O2SO2,ΔH=71Kcal
what is ΔHfofH2S

A
2.7 Kcal
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B
-2.7 Kcal
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C
5.4 Kcal
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D
-5.4 Kcal
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