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A piston$-$cylinder assembly contains $0\mathrm{.}3$ lb of propane. The propane expands from an initial state where $p_1=60lb\frac{f}{i}n.{?}^2$ and $T_1=90F$

to a final state where $p_2=10lb\frac{f}{i}n.{?}^2$ During the process, the pressure and specific volume are related by $p{v}^2=$ constant.

Determine the energy transfer by work, in Btu.

$W=$

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