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Grade: 12th pass

                        

When 1 mole A reacts with ½ mole of B 2 (A + ½B 2 = AB), 100 Kcal heat is liberated and when 1 mole of A reacts with 2 mole of B 2 ( A + 2B 2= AB 4 ), 200 Kcal heat is liberated . When1 mole of A is completely reacted with excess, of B 2 to form AB as well as AB 4 , 140 Kcal heat is liberated calculate the mole of B 2 used.

4 years ago

Answers : (1)

Vikas TU
12279 Points
							
(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.
4 years ago
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