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What is the law of conservation of mass?
No matter is lost or gained during a chemical reaction.
If a reaction is carried out in a closed system, what can you say about the total mass of the reaction throughout the experiment?
Mass stays constant.
If a reaction is carried out in an open flask and a gas is produced, what can you say about the total mass of the reaction throughout the experiment?
Mass decreases as the gas escapes.
52g of calcium reacts with oxygen to form 79g of calcium oxide. Using the law of conservation of mass, what mass of oxygen is needed?
79 - 52 = 27 Mass of oxygen = 27g