The work done in an open vessel at 300 K, when 112 g iron reacts with dil HCl is :
A
1200 cal
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B
600 cal
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C
300 cal
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D
200 cal
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Solution
The correct option is A 1200 cal Fe+2HCl→FeCl2+H21mol1mol11256=2mol2molNow,V2=VH2andV1=0 (For solid + liquid state) Work done =p(v2−v1)=p(H2−0)=pVH2=nH2RT=2×2×300=1200cal