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  4. One mole of a gas at NTP is suddenly allowed to expand to three times its volume. If Cv= 2R, then the final pressure of the gas will be nearest to

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Q. One mole of a gas at NTP is suddenly allowed to expand to three times its volume. If $C_v$= 2R, then the final pressure of the gas will be nearest to

Thermodynamics

Solution:

$p_1V_1\gamma=p_2V_2\,\gamma.Here \,C_p=3\,R\,and\,\gamma=C_p/C_v=\frac{3}{2}$