$2$ moles of an ideal gas expands isothermally from $5$ $dm^3$ to $10$ $dm^3$ at a constant external pressure of $1.5$ bar. Calculate the work done.
- A$7.5$ $dm^3$ bar
- B$-7.5$ $dm^3$ bar
- C$22.5$ $dm^3$ bar
- D$-22.5$ $dm^3$ bar
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