# 15 5 moles of an ideal monoatomic gas undergoes adiabatic expansion from $5 L$ to $20 L$ against a constant external pressure of 2 bar. $\Delta H$ is equal to -

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5 moles of an ideal monoatomic gas undergoes adiabatic expansion from 5 L to 20 L against a constant external pressure of 2 bar. $\Delta H$ is equal to -