For an ideal gas expanding irreversibly against a constant external pressure of 1 atm from 2 L to 5 L, calculate the wor
w = -Pext Δ V = -1 × (5 - 2) × 101.3 = -1 × 3 × 101.3 = -303.9 J.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Enthalpy Changes - Reaction Formation Combustion and Hess's Law