30. Calcium carbonate reacts with HCI to give CaCl2 and Co, according to the reaction; Caco (8) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H.O(1) What mass of 20% impure Caco, is required to react completely with 250 mL of 0.50 MHCI? (1) 6.25 g (2) 5 g (3) 4.75 g (4) 7.8 g
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