Based on the law of conservation of mass, there is no loss in mass in the reaction, however carbon dioxide gas is evolved.
The law of conservation of mass states that for a chemical change occurring, the sum of masses before and after the reaction is constant.
Based on the law of conservation of mass, the reaction between 10.04g of calcium carbonate and 20cm3 of 1m hydrochloric acid will have the same mass before and after the reaction. Any change in mass will be due to evolution of carbon dioxide gas.
Therefore, there is no loss in mass in the reaction, however carbon dioxide gas is evolved.
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