06. Enthalpy and standard Enthalpies For Different Types of Reaction
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Thermodynamics

273099 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpy of combustion of benzene $(l)$ and acetylene (g) are $-3268 \mathrm{kJmol}^{-1}$ and $-1300 \mathrm{kJmol}^{-1}$, respectively. The change in enthalpy for the reaction $3 \mathrm{C}_2 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{C}_6 \mathrm{H}_6(l)$, is

1 $+324 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $+632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $-732 \mathrm{kJmol}^{-1}$
Shift-II
Thermodynamics

273100 The standard enthalpy of formation of $\mathrm{CH}_4(\mathrm{~g})$
$\mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$ are $-75 \mathrm{~kJ} \mathrm{~mol}^{-1},-393 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ and $-286 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The amount of heat liberated (in $\mathrm{kJ}$ ) when $3.2 \mathrm{~g}$ of methane gas is burnt under standard conditions is

1 89
2 278
3 890
4 965
5 178
Shift-I
Thermodynamics

273101 $\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g})$ ? $\mathrm{g} 2 \mathrm{NH}_3(\mathrm{~g})$
Then $\Delta \mathrm{H}$ is equal to :

1 $\Delta \mathrm{U}+2 \mathrm{RT}$
2 $\Delta \mathrm{U}-2 \mathrm{RT}$
3 $\Delta \mathrm{U}+\mathrm{RT}$
4 $\Delta \mathrm{U}-\mathrm{RT}$
CG PET-22.05.2022
Thermodynamics

273102 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpies of combustion are as given below :
| Substance | $\mathbf{H}_2$ | C(graphite) | $\mathbf{C}_2 \mathbf{H}_6(\mathrm{~g})$ |
| :---: | :--- | :--- | :--- |
| $\frac{\Delta_{\mathrm{c}} \mathrm{H}^{-}}{\mathrm{kJ} \mathrm{mol}^{-1}}$ | -286.0 | -394.0 | -1560.0 |
| | | | |
The enthalpy of formation of ethane is

1 $+54: 0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $-68.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-86.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $+97.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
JEE Main-24.06.2022, Shift-II
NEET DIGITAL LIBRARY
Thermodynamics

273099 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpy of combustion of benzene $(l)$ and acetylene (g) are $-3268 \mathrm{kJmol}^{-1}$ and $-1300 \mathrm{kJmol}^{-1}$, respectively. The change in enthalpy for the reaction $3 \mathrm{C}_2 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{C}_6 \mathrm{H}_6(l)$, is

1 $+324 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $+632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $-732 \mathrm{kJmol}^{-1}$
Shift-II
Thermodynamics

273100 The standard enthalpy of formation of $\mathrm{CH}_4(\mathrm{~g})$
$\mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$ are $-75 \mathrm{~kJ} \mathrm{~mol}^{-1},-393 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ and $-286 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The amount of heat liberated (in $\mathrm{kJ}$ ) when $3.2 \mathrm{~g}$ of methane gas is burnt under standard conditions is

1 89
2 278
3 890
4 965
5 178
Shift-I
Thermodynamics

273101 $\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g})$ ? $\mathrm{g} 2 \mathrm{NH}_3(\mathrm{~g})$
Then $\Delta \mathrm{H}$ is equal to :

1 $\Delta \mathrm{U}+2 \mathrm{RT}$
2 $\Delta \mathrm{U}-2 \mathrm{RT}$
3 $\Delta \mathrm{U}+\mathrm{RT}$
4 $\Delta \mathrm{U}-\mathrm{RT}$
CG PET-22.05.2022
Thermodynamics

273102 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpies of combustion are as given below :
| Substance | $\mathbf{H}_2$ | C(graphite) | $\mathbf{C}_2 \mathbf{H}_6(\mathrm{~g})$ |
| :---: | :--- | :--- | :--- |
| $\frac{\Delta_{\mathrm{c}} \mathrm{H}^{-}}{\mathrm{kJ} \mathrm{mol}^{-1}}$ | -286.0 | -394.0 | -1560.0 |
| | | | |
The enthalpy of formation of ethane is

1 $+54: 0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $-68.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-86.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $+97.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
JEE Main-24.06.2022, Shift-II
Join With Us for More Updates
Thermodynamics

273099 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpy of combustion of benzene $(l)$ and acetylene (g) are $-3268 \mathrm{kJmol}^{-1}$ and $-1300 \mathrm{kJmol}^{-1}$, respectively. The change in enthalpy for the reaction $3 \mathrm{C}_2 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{C}_6 \mathrm{H}_6(l)$, is

1 $+324 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $+632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $-732 \mathrm{kJmol}^{-1}$
Shift-II
Thermodynamics

273100 The standard enthalpy of formation of $\mathrm{CH}_4(\mathrm{~g})$
$\mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$ are $-75 \mathrm{~kJ} \mathrm{~mol}^{-1},-393 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ and $-286 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The amount of heat liberated (in $\mathrm{kJ}$ ) when $3.2 \mathrm{~g}$ of methane gas is burnt under standard conditions is

1 89
2 278
3 890
4 965
5 178
Shift-I
Thermodynamics

273101 $\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g})$ ? $\mathrm{g} 2 \mathrm{NH}_3(\mathrm{~g})$
Then $\Delta \mathrm{H}$ is equal to :

1 $\Delta \mathrm{U}+2 \mathrm{RT}$
2 $\Delta \mathrm{U}-2 \mathrm{RT}$
3 $\Delta \mathrm{U}+\mathrm{RT}$
4 $\Delta \mathrm{U}-\mathrm{RT}$
CG PET-22.05.2022
Thermodynamics

273102 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpies of combustion are as given below :
| Substance | $\mathbf{H}_2$ | C(graphite) | $\mathbf{C}_2 \mathbf{H}_6(\mathrm{~g})$ |
| :---: | :--- | :--- | :--- |
| $\frac{\Delta_{\mathrm{c}} \mathrm{H}^{-}}{\mathrm{kJ} \mathrm{mol}^{-1}}$ | -286.0 | -394.0 | -1560.0 |
| | | | |
The enthalpy of formation of ethane is

1 $+54: 0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $-68.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-86.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $+97.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
JEE Main-24.06.2022, Shift-II
For More Updates join with Us
Thermodynamics

273099 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpy of combustion of benzene $(l)$ and acetylene (g) are $-3268 \mathrm{kJmol}^{-1}$ and $-1300 \mathrm{kJmol}^{-1}$, respectively. The change in enthalpy for the reaction $3 \mathrm{C}_2 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{C}_6 \mathrm{H}_6(l)$, is

1 $+324 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $+632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-632 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $-732 \mathrm{kJmol}^{-1}$
Shift-II
Thermodynamics

273100 The standard enthalpy of formation of $\mathrm{CH}_4(\mathrm{~g})$
$\mathrm{CO}_2(\mathrm{~g})$ and $\mathrm{H}_2 \mathrm{O}(\mathrm{l})$ are $-75 \mathrm{~kJ} \mathrm{~mol}^{-1},-393 \mathrm{~kJ}$ $\mathrm{mol}^{-1}$ and $-286 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively. The amount of heat liberated (in $\mathrm{kJ}$ ) when $3.2 \mathrm{~g}$ of methane gas is burnt under standard conditions is

1 89
2 278
3 890
4 965
5 178
Shift-I
Thermodynamics

273101 $\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g})$ ? $\mathrm{g} 2 \mathrm{NH}_3(\mathrm{~g})$
Then $\Delta \mathrm{H}$ is equal to :

1 $\Delta \mathrm{U}+2 \mathrm{RT}$
2 $\Delta \mathrm{U}-2 \mathrm{RT}$
3 $\Delta \mathrm{U}+\mathrm{RT}$
4 $\Delta \mathrm{U}-\mathrm{RT}$
CG PET-22.05.2022
Thermodynamics

273102 At $25^{\circ} \mathrm{C}$ and 1 atm pressure, the enthalpies of combustion are as given below :
| Substance | $\mathbf{H}_2$ | C(graphite) | $\mathbf{C}_2 \mathbf{H}_6(\mathrm{~g})$ |
| :---: | :--- | :--- | :--- |
| $\frac{\Delta_{\mathrm{c}} \mathrm{H}^{-}}{\mathrm{kJ} \mathrm{mol}^{-1}}$ | -286.0 | -394.0 | -1560.0 |
| | | | |
The enthalpy of formation of ethane is

1 $+54: 0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
2 $-68.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
3 $-86.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
4 $+97.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
JEE Main-24.06.2022, Shift-II
NEET DIGITAL LIBRARY