In which of the following conditions can a chemical reaction not occur?

  • A
    $\Delta H > 0$ and $\Delta S > 0$ with $T\Delta S > \Delta H$
  • B
    $\Delta H < 0$ and $\Delta S < 0$ with $\Delta H > T\Delta S$
  • C
    $\Delta H > 0$ and $\Delta S < 0$
  • D
    $\Delta H < 0$ and $\Delta S > 0$

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Which of the following is correct?

Calculate $\Delta H_f^o$ for $UBr_4$ from the $\Delta G^o$ of reaction and the $S^o$ values: $U_{(s)} + 2Br_2(\ell) \to UBr_{4(s)}$; $\Delta G^o = -788.6 \ kJ$; $S^o \ (J/K \cdot mol): U_{(s)} = 50.3, Br_2(\ell) = 152.3, UBr_{4(s)} = 242.6$.

For a chemical reaction,if $\Delta H = \Delta S > 0$,then $\Delta H = $ ................

For the melting of $3 \ mol$ of ice at $0^o \text{C}$,$\Delta G = \dots \dots$

The values of $\Delta H$ and $\Delta S$ for the reaction,$C_{(graphite)} + CO_{2(g)} \rightarrow 2CO_{(g)}$ are $170 \ kJ$ and $170 \ J \ K^{-1}$ respectively. This reaction will be spontaneous at temperatures greater than ............ $K$.

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