Question

When 5g of calcium is burnt in 25g of oxygen, then 7g of calcium oxide is produced.

What mass of calcium oxide will be produced when 5g of calcium is burnt in 20g of

oxygen ? Which law of chemical combination will govern your answer ? State the law.
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Answer 1

ANSWER:

When 5g of calcium is burnt in 2g of oxygen ,we get 7g of calcium oxide  From this we understand that, calcium  and oxygen combine in the ratio 5:2.    Hence when 5g of calcium is burnt in 20g of oxygen,it will produce only 7g of calcium oxide.   This is in accordance with law of constant proportions.

so the answer is 7g

Explanation:

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Answer 2

Explanation:

Law of conservation of mass states that the mass of reactants taking part in the reaction must be equal to the mass of the products produced in reaction. This holds true for all balanced chemical reactions. In the given case, if  5g of calcium is burnt in 25g of oxygen, this yields 7g of Calcium oxide so when one reactant is reduced then the output product will also be less than 7 g