i) Calculate the molecular weight of the compound present in marble stone. [Ca = 40, C = 12 and O = 16] ii) Calculate the percentage composition of hydrogen and oxygen in water molecule. [H = 1 and O = 16]
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Mass of the elemenet in the compound Molar mass of the compound -*100
Molar mass of
= 100
CaCO3 % of Ca Mass of Ca in the compound Molar mass of CaCO3 x 100
40
100
-x 100 = 40%
% of C Mass of C in the compound Molar mass of CaCO3 x 100
12 100 -x 100 = 12%
% of 0 = Mass of oxygen in the compound Molar mass of CaCO3 x 100
3 x 16 100 x 100 = 48%
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