Suppose that 3.00 mol of NO(g) is introduced into a 1.00L flask. When the system comes to equilibrium, 1.00 mol of N2O (g) has formed.

Question

Suppose that 3.00 mol of NO(g) is introduced into a 1.00L flask. When the system comes to equilibrium, 1.00 mol of N2O (g) has formed.

2N2O(g)+O2(g)⇌ 4NO(g)

What is the equilibrium concentration of N2O(g).

a)none of these

b)1.00 mol/L

c)0.5 mol/L

d)4.00 mol/L

e)2.00 mol/L

Answer 1

2N2O + O2 <===> 4NO

.................................3.00......Initial

+2x.........+x.............-4x.........Change

1.00........0.5............1............Equilibrium

K = [NO]⁴ / [N₂O]²[O²] = (1)⁴ / (1)²(0.5)

K = 0.5 (answer c)