ICE Tables:
Equilibrium

Step 3: Fill in an entry in the C row, using a variable to represent a change in concentration, if necessary.

Since there is initially no NO (g) present, LeChatelier's Principle states that some N₂ (g) and O₂ (g) will react to produce some NO (g). Right now, you don't know how much, however. Why don't you let x represent the amount by which the N₂ concentration will decrease. Since the amount of N₂ is decreasing, enter -x in the C row for N₂ and click on the Enter button.

	N2 (g) +	O2 (g)		2 NO (g)
I	0.319	0.0859		0
C
E