I would like to understand how to approach this question. Your help is appreciat
ID: 1031121 • Letter: I
Question
I would like to understand how to approach this question. Your help is appreciated!
Predict the direction in which the system will move to reach equilibrium at 2000°C....
18. Predict the direction in which the system will move to reach equilibrium at 2000°C íf04 moles of N2, 0.1 moles of O2, and 0.08 moles of NO are placed in a 1.0-liter container. A) The system remains unchanged. B) The concentration of NO will decrease; the concentrations of N2 and O2 will C) The concentration of NO will increase; the concentrations of N2 and O2 will D) The concentration of NO will decrease; the concentrations of N2 and 02 will ncrease. decrease remain unchanged.
Explanation / Answer
Direction of reaction,
N2(g) + O2(g) --> 2NO(g)
the direction of reaction with 0.4 M N2, 0.1 M O2 and 0.08 mol NO
B) the concentration of NO will decrease, the concentration of N2 and O2 will increase
explanation,
Kc for the reaction from literature is 2.5 x 10^-3
with given initial concentration, Kc = 0.08/(0.4 x 0.1) = 2
To reduce this value to Kc 2.5 x 10^-3, the concentration of product NO must decrease and reactants must increase. therefore the reverse reaction will be spontaneous here.