one mole of an ideal gas is allowed to expand at 25 degree celsius till its pressure falls to one- fifth of its original pressure. find out the free energy
"E=\u22122.303\u00d7nRTlog\\frac{P_1}{P_2}"
"E=-2.303\u00d71\u00d78.314\u00d7298log\\frac{1}{0.2}=3.98kJ"
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