If the standard enthalpy of sublimation $(\Delta_{sub} H^{\circ})$ of solid $CO_2$,naphthalene,$Li$ and $Na$ are $25.2, 73.0, 162, 108 \ kJ \ mol^{-1}$ respectively,the order of ease of sublimation of these substances is:
- A$Solid \ CO_2 > Naphthalene > Na > Li$
- B$Solid \ CO_2 > Na > Naphthalene > Li$
- C$Li > Na > Naphthalene > Solid \ CO_2$
- D$Na > Li > Naphthalene > Solid \ CO_2$
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Similar Questions
Which of the following is (are) an endothermic reaction?
MediumIIT 1999
View SolutionFor the hypothetical reaction
$A_{2(g)} + B_{2(g)} \rightleftharpoons 2AB_{(g)}$
$\Delta_r G^o$ and $\Delta_r S^o$ are $20 \ kJ/mol$ and $-20 \ J K^{-1} mol^{-1}$ respectively at $200 \ K$.
If $\Delta_r C_P$ is $20 \ J K^{-1} mol^{-1}$ then $\Delta_r H^o$ at $400 \ K$ is.....$kJ/mol$
$A_{2(g)} + B_{2(g)} \rightleftharpoons 2AB_{(g)}$
$\Delta_r G^o$ and $\Delta_r S^o$ are $20 \ kJ/mol$ and $-20 \ J K^{-1} mol^{-1}$ respectively at $200 \ K$.
If $\Delta_r C_P$ is $20 \ J K^{-1} mol^{-1}$ then $\Delta_r H^o$ at $400 \ K$ is.....$kJ/mol$
Medium
View SolutionFor the combustion reaction $2C_8H_{18}(g) + 25O_2(g) \rightarrow 16CO_2(g) + 18H_2O(g)$,what are the signs of $\Delta H$,$\Delta S$,and $\Delta G$?
Medium
View SolutionMatch the thermodynamic processes given under Column $I$ with the expression given under Column $II$:
Column $I$
Column $II$
$A$. Freezing of water at $273 \ K$ and $1 \ atm$
$P$. $q=0$
$B$. Expansion of $1 \ mol$ of an ideal gas into a vacuum under isolated conditions
$Q$. $w=0$
$C$. Mixing of equal volumes of two ideal gases at constant temperature and pressure in an isolated container
$R$. $\Delta S_{sys} < 0$
$D$. Reversible heating of $H_{2(g)}$ at $1 \ atm$ from $300 \ K$ to $600 \ K$,followed by reversible cooling to $300 \ K$ at $1 \ atm$
$S$. $\Delta U=0$
$T$. $\Delta G=0$
| Column $I$ | Column $II$ |
| $A$. Freezing of water at $273 \ K$ and $1 \ atm$ | $P$. $q=0$ |
| $B$. Expansion of $1 \ mol$ of an ideal gas into a vacuum under isolated conditions | $Q$. $w=0$ |
| $C$. Mixing of equal volumes of two ideal gases at constant temperature and pressure in an isolated container | $R$. $\Delta S_{sys} < 0$ |
| $D$. Reversible heating of $H_{2(g)}$ at $1 \ atm$ from $300 \ K$ to $600 \ K$,followed by reversible cooling to $300 \ K$ at $1 \ atm$ | $S$. $\Delta U=0$ |
| $T$. $\Delta G=0$ |
The molar heat of formation of $NH_4NO_{3(s)}$ is $-367.54 \ kJ \ mol^{-1}$ and those of $N_2O_{(g)}$ and $H_2O_{(l)}$ are $+81.46 \ kJ \ mol^{-1}$ and $-285.78 \ kJ \ mol^{-1}$ respectively at $25 \ ^oC$ and $1.0 \ atm$ pressure. Calculate $\Delta U$ at $25 \ ^oC$ for the reaction:
$NH_4NO_{3(s)} \rightarrow N_2O_{(g)} + 2H_2O_{(l)}$ (in $kJ$)
$NH_4NO_{3(s)} \rightarrow N_2O_{(g)} + 2H_2O_{(l)}$ (in $kJ$)
Difficult
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