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CGP EDU Academic Team
Published on: August 14, 2026
The work done in an open vessel at 300 K, when 112 g iron reacts with dil. HC1 is (R = 2 cal mol -1 K -1 )
Text Solution
Verified by ExpertsThe correct answer is:
A
1200 cal
Fe + 2HC1 
FeCl 2 + H 2
1 mol 1 mol
mol 2 mol
Now, V 2 = 
and V 1 = 0 (For solid + aqueous state)
Work done = -p ext 
V
= - 
(PV) = - 
RT
= -2 x 2 x 300
= - 1200 cals (Work of expansion)
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