show that the chemical reaction in which calcium burns with oxygen to form calcium oxide is according to law of conversation of mass
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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 qith 3.5g of CaO.
Ratio of O reacting with Ca to form CaO is 1:1.
Hence results illustrate the law of definite proportion
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