Two moles of an ideal gas are expanded isothermally from $15 \ dm^3$ to $20 \ dm^3$. If the amount of work done is $-6 \ dm^3 \ bar$,find the external pressure needed to obtain this work.
- A$1.2 \times 10^5 \ Pa$
- B$3.2 \ Pa$
- C$8.1 \times 10^4 \ Pa$
- D$2.4 \ Pa$
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