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The answer of this question as per the answer key is 11, but I m not getting it. Please help.

The answer of this question as per the answer key is 11, but I m not getting it. Please help. 
 

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Grade:12th pass

1 Answers

Arun
25750 Points
4 years ago
 
(A + ½B2 = AB) => 100kcal
(A +2B2 = AB4) => 200kcal
Adding both chemical eqns. we get,
2A + 5/2 B2  -------->  1/2AB   +  1/2AB4
OR
A + 5/4 B2  -------->  1/4AB   +  1/4AB4
Total Energy = 100 + 200 = 300 kcal.
 
For original reacn.
 
The energy releases = 140 kcal.
Now for 140 kcal let x be the moles of B2 used then,
then x = > 140 x 5/4 / 300 = > 7/12 moles.

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