The reaction quotient can be obtained from the initial concentration while the equilibrium constant can only be obtained from the concentrations at equilibrium.
The term reaction quotient refers to the amount of reactants and products that are present in the system at a particular time. Given a reaction;
H2(g) + I2(g) ⇄ 2HI
Qc = [HI]^2[H2] [I2]
The question is incomplete as the other details are not clear. However, It is important to note that reaction quotient can be obtained from the initial concentration while the equilibrium constant can only be obtained from the concentrations at equilibrium.
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