Calculate Ratios In the following reaction, how many molecules of HCI are needed to produce four molecules of H20? 2HCl(aq) + Ca(OH)2(aq) +CaCl2(aq) + 2H20(1)
Mole ratios are used as conversion factors between products and reactants in stoichiometry calculations.. For example, in the reaction . 2H₂(g) + O₂(g) → 2H₂O(g) The mole ratio between O₂ and H₂O is #(1 mol O₂)/(2 mol H₂O)#.