An ideal gas is expanded irreversibly from \( 5 \mathrm{~L} \) P to...

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An ideal gas is expanded irreversibly from \( 5 \mathrm{~L} \)
P to \( 10 \mathrm{~L} \) against a constant external pressure of 1

W bar. The value of heat involved \( (q) \) in this is enthalpic process is
(1) 0
(2) \( +500 \mathrm{~J} \)
(3) \( +5 \mathrm{~J} \)
(4) \( -500 \mathrm{~J} \)
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