NH3(g) + HCl(s) → NH4Cl(s) The Entropy Change In The System ...

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5. \(NH_{3(g)} + HCl_{(...

\(NH_{3(g)} + HCl_{(g)} → NH_4Cl_{(s)}\) The entropy change in the system above is

Chemistry JAMB 2008

\(NH_{3(g)} + HCl_{(g)} → NH_4Cl_{(s)}\) The entropy change in the system above is

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

Correct Answer: Option C

Explanation

\(NH_{3(g)} + HCl_{(g)} → NH_4Cl_{(s)}\) Reactant = 2 moles of gaseous molecules Product = 1 mole of gaseous molecule Entropy change = 1 - 2 = -1 (negative)

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