# Calculate Kc?

At a certain temperature, 0.920 mol SO3 is placed in a 3.50 L container.

2SO3(g)↽−−⇀2SO2(g)+O2(g)

At equilibrium, 0.170 mol O2 is present. Calculate 𝐾c.

Relevance
• Anonymous
2 months ago

Sorry, my answer is "Anonymous" as your post is Anonymous. There is no need for an Anonymous question in this category, Most 'Anonymous' posts are trolls, maybe yours is not, but the high likelihood is there. If you post as yourself, I would be glad to help you with any problem you have.

I spend a lot of time on each problem, I just want to make sure it's for a worthwhile cause.

• At a certain temperature, 0.920 mol of SO3 is placed in a 3.50-L container.

2SO3(g) <---> 2SO2(g)+O2(g)

At equilibrium, 0.170 mol of O2 is present. Calculate Kc.

[SO3] = 0.92/3.5 = 0.26285M

[SO2] = 0

[O2] = 0

in equilibrium

[SO3] = 0.26285 - 2x

[SO2] = 0 +2x

[O2] = 0 + x = 0.170/3.5 = 0.04857

x = 0.04857

[SO3] = 0.26285 - 2*0.04857 = 0.1657

[SO2] = 0 +2x = 2*0.04857 = 0.097

K = [SO2]^2[O2] / [SO3]^2

K = (0.097^2)(0.04857 )/(0.1657^2) = 0.1670