OnlineCBT
Chemistry · THERMODYNAMICS
हिन्दीDuring a single-step compression of a gas by a constant external pressure \( p_{\text{ex}} \), the volume changes from \( V_i \) to \( V_f \). The expression for work done on the system is:
Correct answer · Option 1
\( w = -p_{\text{ex}}(V_f - V_i) \)
Explanation
By definition, mechanical work done on/by the gas against external pressure is \( w = -p_{\text{ex}}\Delta V = -p_{\text{ex}}(V_f - V_i) \).
