Which of the following reactions has $\Delta S > 0$?

  • A
    $CaO_{(s)} + CO_{2(g)} \rightleftharpoons CaCO_{3(s)}$
  • B
    $NaCl_{(aq)} \rightleftharpoons NaCl_{(s)}$
  • C
    $NaNO_{3(s)} \rightleftharpoons Na^+_{(aq)} + NO_{3(aq)}^-$
  • D
    $N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$

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Which of the following equations indicates an increase in entropy?

The enthalpy change for the transition of liquid water to steam at $373 \, K$ is $40.8 \, kJ \, mol^{-1}$. What is the $\Delta S$ for the process in $J \, K^{-1} \, mol^{-1}$?

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