For the reaction, \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}_{(1)}+3 \mathrm{O}_{2(\mathrm{g})} \rightarrow 2…

For the reaction, \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}_{(1)}+3 \mathrm{O}_{2(\mathrm{g})} \rightarrow 2 \mathrm{CO}_{2(\mathrm{g})}+3 \mathrm{H}_2 \mathrm{O}_{(1)}\) $\Delta \mathrm{U}$ is the heat of reaction at constant volume. Then heat of reaction at constant pressure is
  1. $\Delta \mathrm{H}=\Delta \mathrm{U}+\mathrm{RT}$
  2. $\Delta \mathrm{H}=\Delta \mathrm{U}+2 \mathrm{RT}$
  3. $\Delta \mathrm{H}=\Delta \mathrm{U}-2 \mathrm{RT}$
  4. $\Delta \mathrm{H}=\Delta \mathrm{U}-\mathrm{RT}$

Solution

$\begin{aligned} & \Delta H=\Delta U+(2-3) R T \\ & \Delta H=\Delta U-R T\end{aligned}$

Asked in: MHT CET 2022 (07 Aug Shift 2)

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