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10 grams of CaO (Mr = 56.08) were needed for the reaction of a 2,5 L solution containing hydrochloric acid (Mr = 36.46). How many grams of CaCl2 (Mr = 110.98) can be prepared? What was the concentration of the hydrochloric acid?
CaO + HCl = CaCl2 + H¬2O