1.17 conservation of mass

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1
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What is the law of conservation of mass?

No matter is lost or gained during a chemical reaction.

2
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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.

3
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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.

4
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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