The standard entropy change for the reaction $4 Fe ( s ) + 3 O_{2} ( g ) \rightarrow 2 Fe_{2} O_{3} ( s )$ is $-550 \ J K^{-1}$ at $298 \ K$. Given: The standard enthalpy change for the reaction is $-165 \ kJ \ mol^{-1}$. The temperature in $K$ at which the reaction attains equilibrium is ... . (Nearest Integer)
- A$30$
- B$300$
- C$210$
- D$670$
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Compare the following criteria for spontaneity of a reaction based on the values of $\Delta_{\text{r}}H^0$,$\Delta_{\text{r}}S^0$,and $\Delta_{\text{r}}G^0$:
$\Delta_{\text{r}}H^0$ $\Delta_{\text{r}}S^0$ $\Delta_{\text{r}}G^0$ Description $(a) (+)$ $(-)$ $(+)$ $(i) \text{ Non-spontaneous at all temperatures}$ $(b) (-)$ $(-)$ $(-)$ $(ii) \text{ Spontaneous at low temperatures}$ $(c) (-)$ $(+)$ $(-)$ $(iii) \text{ Spontaneous at all temperatures}$
| $\Delta_{\text{r}}H^0$ | $\Delta_{\text{r}}S^0$ | $\Delta_{\text{r}}G^0$ | Description |
|---|---|---|---|
| $(a) (+)$ | $(-)$ | $(+)$ | $(i) \text{ Non-spontaneous at all temperatures}$ |
| $(b) (-)$ | $(-)$ | $(-)$ | $(ii) \text{ Spontaneous at low temperatures}$ |
| $(c) (-)$ | $(+)$ | $(-)$ | $(iii) \text{ Spontaneous at all temperatures}$ |
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View SolutionFor the reaction $x + y \rightarrow z$,the process is spontaneous at room temperature,and the reverse reaction is spontaneous at high temperature. Which of the following is true?
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View SolutionCalculate the work done during the reversible isothermal expansion of $2 \ mol$ of an ideal gas at $298 \ K$ from $10 \ L$ to $20 \ L$ in $J$. (in $.9$)
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View SolutionFor a reaction with $\Delta H = +ve$ and $\Delta S = +ve$,which of the following statements is correct?
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View SolutionThe dependence of Gibbs free energy on pressure for an isothermal process of an ideal gas is given by:
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