Question

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

• A. $163.7cal$
• B. $zero$
• C. $138.1cal$
• D. $9litreatm$

Answer 1

The correct option is B $zero$

For ideal gas, $\Delta U=n{C}_{v}dT$

For isothermal process, dT = 0

Hence, Change in internal energy($\Delta E$) is zero during isothermal expansion of a gas.

Option (B) is correct.