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what should be the value of final temperature so that 1L gas becomes 2.5L at constant pressure if initial temperature was 300K

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Q. One mole of an ideal monoatomic gas expands isothermally against constant external pressure of 1 atm from initial volume of 1L to a state where its final pressure becomes equal to external pressure. If initial temperature of gas is 300 K then total entropy change of system in the above process is :
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