The enzyme aldolase catalyzes the conversion of fructose‐1,6‐
bisphosphate to dihydroxyacetone phosphate and glyceraldehyde‐3‐
phosphate. ΔG°’ for the reaction is +23.8 kJmol‐1, whereas ΔG in the cell
is ‐1.3 kJmol‐1. Calculate the ratio of products to reactants under
equilibrium and intracellular conditions. (7×10‐5; 3.7×10‐5)

I have this problem which I worked out and got the answer correct but on using the equation ΔG = ΔG° + RT ln Qp in order to find the ratio I found a problem. IF Q is the ratio of products and reactants at equilibrium then why is it that ΔG is not zero because we know that ΔG should be zero at equilibrium?