(A) The chemical reaction is: $NH_3(g) + HCl(g) \rightarrow NH_4Cl(g)$The change in the number of moles of gaseous species is calculated as:$\Delta n_

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(A) The chemical reaction is: $NH_3(g) + HCl(g) \rightarrow NH_4Cl(g)$The change in the number of moles of gaseous species is calculated as:$\Delta n_g = n_{p(g)} - n_{r(g)} = 1 - (1 + 1) = 1 - 2 = -1$Using the thermodynamic relation:$\Delta H = \Delta U + \Delta n_g RT$Substituting $\Delta n_g = -1$:$\Delta H = \Delta U - RT$Since $RT$ is positive,it follows that $\Delta H < \Delta U$.

Class 11 Chemistry Thermodynamics First law of thermodynamics

Medium

When one mole of $NH_3$ gas and one mole of $HCl$ gas are mixed in a closed container to form ammonium chloride gas,which of the following is true?

A
$\Delta H < \Delta U$
B
$\Delta H > \Delta U$
C
$\Delta H = \Delta U$
D
There is no relationship between $\Delta H$ and $\Delta U$.

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When one mole of $NH_3$ gas and one mole of $HCl$ gas are mixed in a closed container to form ammonium chloride gas,which of the following is true?

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