Question
Question: \(K _ { c }\) for the reaction \(A ( g ) + B ( g )\) ⇌ 2*C*(*g*) is 3.0 at 400*K*. In an experimen...
Kc for the reaction A(g)+B(g) ⇌ 2C(g) is 3.0 at 400K. 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
3.5mol
Answer
2.5 mol
Explanation
Solution
⇌ 2C(g)
0
2 x
From the equation, 2x = 3 ⇒ x = 1.5
Kc=(a−x)(b−x)4x2; 3=(a−1.5)(3−1.5)4×(1.5)2;
3=(a−1.5)(1.5)4×2.25 ⇒ a = 3.5