The standard heat of formation Delta fH2980 of ethane in kjm

Question

The standard heat of formation ( Delta _fH_298^0 ) 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 :

DivineJEE · Accepted Answer

2C(graphite)+ 3H(g) -> C_(2)H_(6)(g) Delta _fH(C_(2)H_(6)) = 2Delta H_(comb)(C_(graphite)) + 3Delta H_(comb)(H_(2)) - Delta H_(comb)(C_(2)H_(6)) = – (286 x 2) - (393.5 x 3) -(-1560) = -572 –1180.5+1560 = -192.5 kJ/mole

Explanation

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