4.0 \( \mathrm{L} \) of an ideal gas is allowed to expand isothermally into vacuum until the tot...

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4.0 \( \mathrm{L} \) of an ideal gas is allowed to expand isothermally into vacuum until the total volume is \( 20 \mathrm{~L} \). The amount of heat absorbed in this expansion is \( \mathrm{L} \) atm.
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