Which of the following is the mathematical expression for Qc for the reaction 2H₂(g)+O₂(g)→2H₂O(l)?
a) [H₂O]²/[H₂]²[O₂]
​b) [H₂O]²/[H₂]2[O₂]²
c) [H₂]²O]/[H₂O]²
d) [H₂][O₂]²/H₂O]²