Question

A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g if boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.

  • atoms and molecules CBSE Class 9
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Answer

Mass of boron = 0.096g                 (Given)

Mass of oxygen = 0.144g               (Given)

Mass of sample = 0.24g                (Given)

Thus, percentage of boron by weight in the compound ={0.096×100\over0.24}%

= 40%

Thus, percentage of oxygen by weight in the compound ={0.144×100\over0.24}%

= 60 %

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