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Hence, the total mass of reactants = total mass of products. When hydrogen gas burns and combines with oxygen to form water, the mass of the water formed is equal to the mass of the hydrogen and oxygen consumed. Thus, this is in accordance with the law of conservation of mass. What do you observe in the image above? During a chemical reaction, the sum of the masses of the reactants and products remain unchanged. This is known as the Law of Conservation of Mass As per this law , Matter can never be created nor destroyed Total Mass of Reactants = Total Mass of Products Example 1 When 100 grams of calcium carbonate is heated,it produces 56 grams of Calcium oxide and 44 grams of Carbon Dioxide Calcium Carbonate −−−−−−> Calcium Oxide + Carbon Dioxide 1 1st ... Learn the definition, statement, and examples of the law of conservation of mass , which states that matter is neither created nor destroyed in a closed system. Find out how the law applies to chemical reactions, organisms, and ecosystems, and how it differs from nuclear reactions. Hence, the total mass of reactants = total mass of products. When hydrogen gas burns and combines with oxygen to form water, the mass of the water formed is equal to the mass of the hydrogen and oxygen consumed. Thus, this is in accordance with the law of conservation of mass .