Question

K for the reaction A(g) + B(g) = 2C(g) is 3.0 at 400 K. In an experiment a mol of A is mixed
with 3 mol of B in a 1-L vessel. At equilibrium 3 mol of C is formed. The value of a will be
(A) 4.5 mol (B) 9.5 mol (C) 2.5 mol (D) 3.5 mol
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Answer 1

Answer:

Kc for the reaction A(g) +B(g) = 2C(g) , is 3.0 at 400 K. In an experiment 'a' mol of A is mixed with 3 mol of B in a 1-L vessel. At equilibrium 3 mol of C is formed. Therefore the value of a is 3.5 mol.16

Explanation:

A(g)+B(g)⇌2C(g)

t=0 3M 1M 0

t=α 3−

3

1

1−

3

1

3

2

K

C

=

(8/3)(2/3)

(2/3)

2

=

4

1

=0.25