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Question

When 5 gram of calcium is burnt in 2 gram of oxygen then 7 gram of calcium oxide is produced. What mass of calcium oxide will be produced when 5 gram of calcium is burnt in 20 gram of oxygen? Which law of chemical combination will govern your answer?

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Solution

5.0 g of calcium combines with 2.0 g of oxygen to give 7.0g of calcium oxide.Thus, by the law of definite proportions, when 5.00 g of calcium is burnt in 20.00 g of oxygen, only 2.00 g of oxygen will be used to produce 7.00 gram of calcium oxide. The remaining 18.00 g of oxygen will remain as is.

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