JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
The standard heat of formation \(\left(\Delta_{t} \mathrm{H}_{298}^{0}\right)\) of ethane in \((kJ/mol)\), if the heat of combustion of ethane, hydrogen and graphite are \(-1560\), \(-393.5\) and \(-286 \;\mathrm{kJ} / \mathrm{mol},\) respectively is ........... \(\mathrm{kJ/mol}\)
- A \(-172.5\)
- B \(-192.5\)
- C \(-202.5\)
- D \(-162\)
Answer & Solution
Correct Answer
(B) \(-192.5\)
Step-by-step Solution
Detailed explanation
\(2 \mathrm{C}(\text { graphite })+3 \mathrm{H}_{2}(\mathrm{g}) \longrightarrow \mathrm{C}_{2} \mathrm{H}_{6}(\mathrm{g})\)…
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