JEE Main 2020 Chemistry question
The standard heat of formation () 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 .
Answer: -192.5
Solution
With the values exactly as printed, ΔfH = 2(−286) + 3(−393.5) − (−1560) = −192.5 kJ/mol; the paper's key prints 192.5 (sign dropped). Note
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