Question

What is the equilibrium expression for 2NO + Br2 <---> 2NOBr

Answer 1

products over reactants.

Answer 2

For a reaction at equilibrium,
\[\LARGE aA~+~bB~\rightleftharpoons~ cC~+~dD\]
\[\LARGE K_c=\frac{ [C]^c [D]^d }{ [A]^a[B]^b }\]

Answer 3

I was going to let him/her try it out first, but guess not.

Answer 4

Reason being is because I think most student know the answers but often are too shy or scared to try it because they are afraid they are wrong or will be looked at differently, when in fact, they probably know the answer and are correct!
I am also speaking from experience.