Problem involving chemical equilbrium?

H2(g) + I2(g)⇋ 2HI(g)
The system is at equilibrium at a given temperature in a
2 L container. If the system has 0.2 mol of H2, 0.2 mol
of I2, and 0.6 mol of HI at equilibrium; how many moles
of HI should be added to increase the mol number of
H2 to 0.4?
3 answers 3