For which of the following processes,$\Delta S$ is negative?

  • A
    $C$ (diamond) $\to$ $C$ (graphite)
  • B
    $N_2(g, 1 \ atm) \to N_2(g, 5 \ atm)$
  • C
    $N_2(g, 273 \ K) \to N_2(g, 300 \ K)$
  • D
    $H_2(g) \to 2H(g)$

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Given the entropy of $H_2$ and $HBr$ are $130.6 \, JK^{-1}$ and $198.5 \, JK^{-1}$ respectively,calculate the entropy of $Br_{2(g)}$ in the reaction $H_{2(g)} + Br_{2(g)} \rightarrow 2HBr_{(g)}$ where $\Delta S^{o} = 20.1 \, JK^{-1}$.

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