JEE Advanced 2025 Chemistry question
Considering ideal gas behavior, the expansion work done (in kJ) when 144 g of water is electrolyzed completely under constant pressure at 300 K is . Use: Universal gas constant (R) = 8.3 J K⁻¹ mol⁻¹; Atomic mass (in amu): H = 1, O = 16
Answer: -29.88
Solution
144 g water = 8 mol: gives 8 mol H₂ + 4 mol O₂ = 12 mol gas (the liquid's volume is negligible). Work
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