A closed system of gas expands isobarically from an initial volume to a final volume…

CHEMISTRY · Single correct · CBSE · Chemistry · Thermodynamics · Thermodynamics

Problem

A closed system of gas expands isobarically from an initial volume

V_i

to a final volume

V_f

under a constant external pressure

P_{\text{ext}}

. Which expression gives the work

W

done on the gas during this process? (a)

P_{\text{ext}}(V_f-V_i)

(b)

-\dfrac{1}{2}P_{\text{ext}}(V_f-V_i)

(c)

-P_{\text{ext}}(V_f-V_i)

(d)

-P_{\text{ext}}V_i\ln\!\left(\dfrac{V_f}{V_i}\right)