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An ideal gas expands isothermally from $10^{-3}$ m$^3$ to $10^{-2}$ m$^3$ at 300 K against a constant pressure of $10^5$ N m$^{-2}$. The work done on the gas is:
Detailed Solution
$w=-P_{ext}(V_f-V_i)=-10^5(10^{-2}-10^{-3})=-10^5\times9\times10^{-3}=-900$ J.