Calcium and oxygen combine in the ratio of 5:2 by mass to form calcium oxide. What mass of oxygen gas is required to react completely with 25 g of calcium. Which law of chemical combination will govern your answer?
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We know that calcium and oxygen react in a fixed ratio of 5:2, by mass, to produce 7g of calcium oxide. When 5g of calcium react with 20g of oxygen, the same amount of calcium oxide will be formed. Therefore, 7g of calcium oxide will be formed when 5g of calcium will react with 20g of oxygen.
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Answer:
10g of oxygen is needed to react with 25g of calcium. Law Of conservation of mass
Explanation:
calcium : oxygen =5:2
Calcium =25g
Oxygen =25/5x2=10g
Law of conservation of mass states that the mass can neither be created nor destroyed
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