Which one of the following reactions has Delt | vedclass

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(C) The relationship between enthalpy change $(\Delta H)$ and internal energy change $(\Delta U)$ is given by the equation: $\Delta H = \Delta U + \De

Vedclass · Accepted Answer

$2HI_{(g)} \rightleftharpoons H_{2(g)} + I_{2(g)}$

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(C) The relationship between enthalpy change $(\Delta H)$ and internal energy change $(\Delta U)$ is given by the equation: $\Delta H = \Delta U + \Delta n_g RT$.
For $\Delta H = \Delta U$ to hold true,the term $\Delta n_g$ must be equal to $0$.
$\Delta n_g$ is the difference between the sum of stoichiometric coefficients of gaseous products and gaseous reactants.
For the reaction $2HI_{(g)} \rightleftharpoons H_{2(g)} + I_{2(g)}$:
$\Delta n_g = (1 + 1) - 2 = 0$.
Therefore,for this reaction,$\Delta H = \Delta U$.

Which one of the following reactions has $\Delta H = \Delta U$?

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