Question

2.8 of calcium oxide prepared by heating limestone was found to contain 0.8g of oxygen. When 1.0g of oxygen is treated with calcium 3.5g of calcium oxide was obtained . Show that the results illustrates the law of definite proportion​

Answer 1

Answer:

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Law of definite proportion states that a given compound always contains exactly the same proportion of elements by weight.

Case I-

2.8 g of CaO contains 0.8 g of oxygen.

Thus, mass of calcium in CaO = 2.8 – 0.8 = 2 g

Ratio of mass of calcium to oxygen = 2/0.8=2.5

Case II-

3.5 g of CaO contains 1 g of oxygen.

Thus, mass of calcium in CaO = 3.5 – 1 = 2.5 g

Ratio of mass of calcium to oxygen = 2.5/1=2.5

Therefore, according to the above given definitions and the results we obtained we can say that the given data illustrates the law of definite proportions.

Answer 2

Answer:

Explanation:

Law of definite proportion states that a given compound always contains exactly the same proportion of elements  by weight.  

Case 1:​ Ca2.8g   O0.8g ⟹1g of O reacts with =0.82.8​=3.5g of CaO

Case 2:​ 3.5g    1g⟹1g of O reacts with 3.5g of CaO

Ratio of O reacting with Ca to form CaO is 1:1.

Hence results illustrate the law of definite proportion.