AIIMS 2019 Chemistry Work Done in Chemical Reactions MCQ Question

When 1 mole of butane (C₄H₁₀) combusts completely, it produces 4 moles of CO₂ and 5 moles of H₂O (liquid) under standard conditions. The change in the number of moles of gas during the reaction leads to work done, calculated using the formula $W = -P \Delta V$. Given that the reaction produces 4 moles of CO₂ gas while consuming 1 mole of butane, the net increase in gas moles is 3, resulting in a work done of 50.3 atm, which corresponds to option C. Other options are incorrect as they do not match the calculated work based on the stoichiometry of the reaction.