Question

calcium carbonate contains 40% of calcium 12% carbon and 14% of oxygen by mass knowing the law of constant proportion holds good.calculate the mass of consulate elements present in grams of calcium carbonate​

Answer 1

According to law of definite proportions, in a chemical substance, the elements are always present in definite proportions by mass. Given data: Percentage of Ca present in CaCO3 – 40% Percentage of C present in CaCO3  - 12% Percentage of O present in CaCO3  - 14%This means 66g of calcium carbonate contains 40g of Ca, 12g of C and 14g of O. Similarly, 2g of Calcium carbonate contains 40% calcium , 12% carbon and 14 % oxygen by mass. Let us find the masses of Ca, C and O present in 2g of CaCO3. Mass of Calcium present in 2g of CaCO3 = 40/100 X2 = 0.8g Mass of Carbon present in 2g of CaCO3 = 12/100 X 2 = 0.24g Mass of Oxygen present in 2g of CaCO3 = 14/12 X 2 = 0.59g.

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Answer 2

Explanation:

Similarly, 2g of Calcium carbonate contains 40% calcium , 12% carbon and 48 % oxygen by mass. Let us find the masses of Ca, C and O present in 2g of CaCO3. Mass of Oxygen present in 2g of CaCO3 = 48/12 X 2 = 0.96g.