(D) For an ideal gas,internal energy $(U)$ and enthalpy $(H)$ are functions of temperature only.In an isothermal process,$\Delta T = 0$,which implies

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$\Delta U=0, Q \neq 0, W \neq 0$ and $\Delta H=0$

(D) For an ideal gas,internal energy $(U)$ and enthalpy $(H)$ are functions of temperature only.In an isothermal process,$\Delta T = 0$,which implies $\Delta U = 0$ and $\Delta H = 0$.From the first law of thermodynamics,$\Delta U = Q + W$. Since $\Delta U = 0$,$Q = -W$.For expansion,work is done,so $W \neq 0$,which means $Q \neq 0$.Therefore,the correct combination is $\Delta U=0, Q \neq 0, W \neq 0$ and $\Delta H=0$.

Class 11 Chemistry Thermodynamics Mix Examples-Thermodynamics and Thermochemistry

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For isothermal expansion of an ideal gas,the correct combination of the thermodynamic parameters will be

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A
$\Delta U=0, Q=0, W \neq 0$ and $\Delta H \neq 0$
B
$\Delta U \neq 0, Q \neq 0, W \neq 0$ and $\Delta H=0$
C
$\Delta U=0, Q \neq 0, W=0$ and $\Delta H \neq 0$
D
$\Delta U=0, Q \neq 0, W \neq 0$ and $\Delta H=0$

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One mole of an ideal monoatomic gas at temperature $T$ expands adiabatically in an insulated flask from $1 \ L$ to $2 \ L$ against an external pressure of $1 \ atm$. What is the final temperature?

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For the reaction $A_{(g)} + 2B_{(g)} \to 2C_{(g)} + 3D_{(g)}$,the value of $\Delta E$ at $27\ ^oC$ is $19.0\ kcal$. The value of $\Delta H$ for the reaction would be.......$kcal$ $(R = 2.0\ cal\ K^{-1} mol^{-1})$

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The values of $\Delta H$ for the combustion of ethene and ethyne are $-341.1 \ kcal$ and $-310.0 \ kcal$ respectively. Which of the following is a better fuel?

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At $300 \ K$,$3.0 \ \text{moles}$ of an ideal gas at $3.0 \ \text{atm}$ pressure is compressed isothermally to one half of its volume by an external pressure of $6.0 \ \text{atm}$. The work done (in $kJ$) is. Given,$R=0.082 \ \text{L atm K}^{-1} \text{mol}^{-1}$ $(1 \ \text{L atm} = 101.3 \ \text{J})$.

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One mole of water is converted into steam at $373 \, K$. The heat absorbed at $1 \, atm$ pressure is $40.68 \, kJ$. If the molar volumes of water and steam are $18 \, mL$ and $30600 \, mL$ respectively,find $\Delta U$ for the process in $kJ$.

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For isothermal expansion of an ideal gas,the correct combination of the thermodynamic parameters will be

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One mole of an ideal monoatomic gas at temperature $T$ expands adiabatically in an insulated flask from $1 \ L$ to $2 \ L$ against an external pressure of $1 \ atm$. What is the final temperature?

For the reaction $A_{(g)} + 2B_{(g)} \to 2C_{(g)} + 3D_{(g)}$,the value of $\Delta E$ at $27\ ^oC$ is $19.0\ kcal$. The value of $\Delta H$ for the reaction would be.......$kcal$ $(R = 2.0\ cal\ K^{-1} mol^{-1})$

The values of $\Delta H$ for the combustion of ethene and ethyne are $-341.1 \ kcal$ and $-310.0 \ kcal$ respectively. Which of the following is a better fuel?

One mole of water is converted into steam at $373 \, K$. The heat absorbed at $1 \, atm$ pressure is $40.68 \, kJ$. If the molar volumes of water and steam are $18 \, mL$ and $30600 \, mL$ respectively,find $\Delta U$ for the process in $kJ$.

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