Chemistry ice table

Question

At 100°C, the reaction: N2(g) +O2(g) <-> 2NO(g) has Keq=0.0010. 7.5mol of NO is added to a 250mL flask. Determine concentrations for each gas at equilibrium.

Answer 1

Nitrogen Oxygen Nitrogen Monoxide (V is constant: use molarity)

I 0 0 7.5 mole/.25 l = 30 M

C x x -2x Let x be Molarity of nitrogen produced

E x x 30-2x

K expression is C_NO²/(C_N2C_O2)

At equilibrium K expression is K(100 degrees C)

.0010 = (7.5-x)²/x² and solve for x which will be N₂ concentration. The others can be derived.

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