Chemistry · 2022
JEE Main · 24 June 2022, Shift 2 · Q64
At 25^° C and 1 atm pressure, the enthalpies of combustion are as given below: The enthalpy of formation of ethane is
At $\displaystyle 25^{\circ} \mathrm{C}$ and $\displaystyle 1$ atm pressure, the enthalpies of combustion are as given below:
The enthalpy of formation of ethane is
| Substance | $\displaystyle \mathrm{H}_2$ | C (graphite) | $\displaystyle \mathrm{C}_2 \mathrm{H}_6(\mathrm{~g})$ |
| $\displaystyle \frac{\Delta_{\mathrm{c}} \mathrm{H}^{\ominus}}{\mathrm{kJ} \mathrm{mol}^{-1}}$ | -$\displaystyle 286.0$ | -$\displaystyle 394.0$ | -$\displaystyle 1560.0$ |
Official answer
(3)
$\displaystyle -86.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
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JEE Main 2022 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.