The standard heat of formation ΔfH2980 of ethane (in kJ/mol), if the heat of combustion of ethane, hydrogen and graphite are -1560, -393.5 and -286 kJ/mol, respectively is ___

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answer is -192.5.

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Detailed Solution

2Cgraphite+3H2g→C2H6g ΔrHC2H6=2ΔHcomCgraphite+3 ΔHcombH2−ΔHcombC2H6 =−286×2−393.5×3−−1560 =−572−1180.5+1560=−192.5 kJ.mole

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