Published by:
CGP EDU Academic Team
Published on: August 13, 2026
If 100 mole of H 2 O 2 decompose at 1 bar and 300 K, the work done (kJ) by one mole of O 2 (g) as it expands against 1 bar pressure is :
2H 2 O 2 ( l ) 
2H 2 O( l ) + O 2 (g) (R = 8.3 J K –1 mol –1 )
Text Solution
Verified by ExpertsThe correct answer is:
C
2H 2 O 2 ( l ) 
2H 2 O( l ) + O 2 (g)
W = –P ext ( Δ V) = – 
RT
100 mol H 2 O 2 on decomposition will give 50 mol O 2
⇒ W = –(50)(8.3)(300)J = –124500 J
W = –124.5 kJ
⇒ Work done by O 2 (g) = 124.5 kJ
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