Question

Oxygen and nitrogen are present in a mixture in the ratio of 1:4 by weight. Calculate the ratio between their
molecules
(a) 7:32
161327
(c) 1:4
(d) 4:1
​

Answer 1

Answer:

1:4

Explanation:

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Answer 2

Explanation:

Correct option is

C

7 : 32

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