Q.

The work done by the gas liberated when 50 g of iron  (molar mass 55.85gmol−1 )  reacts with hydrochloric acid in an open beaker at 25°C

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a

Zero

b

−2.2kJ

c

2.2kJ

d

0.22kJ

answer is B.

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Detailed Solution

w=−∆nRTw=5055.85×8.314×298w=−2218.05J=−2.218kJ
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The work done by the gas liberated when 50 g of iron  (molar mass 55.85gmol−1 )  reacts with hydrochloric acid in an open beaker at 25°C