Exercises
1. A 0.24 g sample of compound of oxygen and boron was found
by analysis to contain 0.096 g of boron and 0.144 g of oxygen.
Calculate the percentage composition of the compound by
weight.
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mass of the given sample compound=0.24g
mass of boron=0.096g
mass of oxygen=0.144g
%composition of compound=1% of boron & 1% of oxygen
%of boron=(mass of boron)/(mass of sample compond) × 100 = 40%
%of oxygen=(mass of oxygen)/(mass of sample compound) × 100 = 60%
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