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CGP EDU Academic Team
Published on: August 14, 2026
One mole of solid Zn is placed in excess of dilute H 2 SO 4 at 27ºC in a cylinder fitted with a piston. Find the work done for the process if the area of piston is 500 cm 2 and it moves out by 50 cm against a pressure of 1 atm during the reaction.
Zn(s) + 2H + (aq) 
Zn 2+ (aq) + H 2 (g)
Text Solution
Verified by ExpertsThe correct answer is:
B
W = – P ext ( Δ V) = –(1 atm) × × 500 × × 50 × × 10 –3 L
= – 25 L atm = – 25 × × 101.3 × × 10 –3 kJ = –2.53 kJ
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