For $1 \, \text{mol}$ of an ideal gas,isothermal expansion occurs from $1 \, \text{L}$ to $10 \, \text{L}$ in a vacuum at $300 \, \text{K}$. What is the value of $\Delta U$ for this process? $(R = 2 \, \text{cal} \, \text{K}^{-1} \, \text{mol}^{-1})$
- A$163.7 \, \text{cal}$
- B$0$
- C$1381.1 \, \text{cal}$
- D$9 \, \text{L} \cdot \text{atm}$
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