Question

One mole of an ideal gas at $300\text{K}$ is expanded isothermally from an initial volume of $1$ litre to $10$ litres. The value of $△U$ for this process is:
$(R=2{\text{cal mol}}^{-1}{\text{K}}^{-1})$

• A. $163.7\text{cal}$
• B. $0$
• C. $138.1\text{cal}$
• D. $9\text{atm L}$

Answer 1

The correct option is B $0$

Internal energy of an ideal gas is dependent on the temperature of the process.
For an isothermal process, the change in internal energy $(\Delta U=0)$ during isothermal expansion of a gas.