Chapter 3: Atoms and Molecules

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Atoms and Molecules

Question:

Q.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.

Answer:

The percentage composition of an element can be expressed as:

mathbf{{color{Red} mathbf{}Percentage composition=frac { Mass of element }{ Total mass of compound } 	imes 100}}

According to the question, 0.24g of compound contains 0.096g of boron and 0.144g of oxygen. So, the compound contains only boron and oxygen atom.

	herefore Total  mass of  compound = 0.096g + 0.144g =0.24g

So, the percentage composition of boron in 0.24g of compound is calculated as shown below:

Percentage composition  of  boron =frac { 0.096 }{ 0.24 } 	imes 100=40%

Therefore, the percentage composition of boron in the given compound is 40 %.

Similarly, the percentage composition of oxygen in 0.24g of compound is calculated as shown below:

Percentage composition  of  oxygen =frac { 0.144 }{ 0.24 } 	imes 100=60%

Therefore, the percentage composition of oxygen in the given compound is 60 %.

 

 

 


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