Problem $3$: $(5\%$ of Assignment Value$)$

A dilute gas expands quasi$-$statically at a constant temperature of $310$ kelvin from an initial volume of $0\mathrm{.}55$ liter to a final volume of $4\mathrm{.}8$ liters.

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If the gas does $250$ joules of work, how many moles of gas are present? n $=$