Write the equilibrium expression for each of the following reactions:

Question

N2 (g) + 3 H2 (g) ↔ 2 NH3 (g) + heat

Please guide me and help!

Answer 1

Here is the LONG version of the definition. How you do it will follow.
When a system is in equilibrium, the product of the products of the reaction, divided by the product of the reactants, each raised to a power indicated by the coefficients in the balanced chemical equation, is a constant.
Here is what you do. Keq = (products)^x/(reactants)^y so
2A + B ==> 3C + D
Keq = (C)^3(D)/(A)^2(B)
(A) is read "concentration of A" and is in mols/L. Similarly for B, C, D.
Let me know if this is not clear. You write the Keq for the reaction and I'll check it for you.