• # question_answer 17) $\Delta {{U}^{{}^\circ }}$of combustion of methane is $-XkJmo{{l}^{-1}}$. The value of$\Delta {{H}^{{}^\circ }}$ is (i)$=\Delta {{U}^{{}^\circ }}$ (ii) $>\Delta {{U}^{{}^\circ }}$ (iii) $Answer: \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\to C{{O}_{2}}(g)+2{{H}_{2}}O(l)$ $\Delta {{n}_{g}}=1-3=-2$ $\Delta {{H}^{{}^\circ }}=\Delta {{U}^{{}^\circ }}-2RT$ $\Delta {{H}^{{}^\circ }}=-X-2RT$ \[\Delta {{H}^{{}^\circ }}

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