Question

element a reacts with oxygen to form a compound a203. if 0.359g of a compound contains 0.128g of oxygen, atomic weight of a will be. pls answer step by step​

Answer 1

Explanation:

Let atomic mass of element A be =a g/mol

Again atomic mass of oxygen = 16 g/mol

So molar mass of the compound A  

2

​

O  

3

​

=(2a+48)g/mol

One molecule of the compound A  

2

​

O  

3

​

 Contains 2 atoms.

So the ratio of mass of A and A  

2

​

O  

3

​

 in a molecule  

2a+48

2a

​

 

Again it is given that 0.359 grams of A reacts to give 0.559 grams of the compound. So we can write

=>  

2a+48

2a

=  

0.559

0.359

=>  

a+24

a

=  

559

359

On solving, a=43.08

So, the correct option is B

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Answer 2

Explanation:

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