Question

Oxygen-nitrogen proportion in air a)1:4 b) 4:1 c)1:3 d)1:1​

Answer 1

Answer:

The number of molecules of a gas is given by the expression,

Numberofmolecules=

Molecularweight

Weight

×N

A

.

Here, N

A

is the Avogadro number.

Assume 1 g and 4 g of oxygen and nitrogen respectively.

Numberofmoleculesofoxygen=

32

1

×N

A

Numberofmoleculesofnitrogen=

28

4

×N

A

The ratio of the number of molecules of oxygen to nitrogen will be =

28

4N

A

32

N

A

=

32

7

=7:32