NH\(_3\)\(_{(g)}\) + HCl\(_{(g)}\) → NH\(_4\)Cl\(_{(s)}\) The entropy change in the system above is

Chemistry

JAMB 2001

NH\(_3\)\(_{(g)}\) + HCl\(_{(g)}\) → NH\(_4\)Cl\(_{(s)}\)
The entropy change in the system above is

A. negative
B. indeterminate
C. positive
D. zero

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Correct Answer: Option A

Explanation

Deposition is a thermodynamic process that occurs when a substance changes from a gas to a solid without passing through the liquid phase. This happens due to a decrease in temperature.The entropy change for the transition from gas to solid is negative because solids have lower entropy compared to gases, gas particles are more disordered and have a higher rate of motion compared to solids that have closely packed particles.

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