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The standard heat of formation (Delta(f)...

The standard heat of formation `(Delta_(f)H_(298)^(@))` 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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The correct Answer is:
192.5
`C_2 H_6(g) + 3.5 O_2(g) to 2CO_2(g) + 3H_2O(l)`
From the given data
`2xx(-286) + 3 xx (-393.5) - (-1560) = -572 - 1180.5 + 1560 = - 192.50 kJ//mol`
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