Question

A vessel of volume 100ml contains 10%O2 90%unknown gas.The gas defusing in 86second through a small vessel.If pure oxygen under the same condition diffuses in 75 second find the molecular mass of unknown gas.
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Answer 1

Explanation:

Answer

Let M

2

and M

1

be the molecular weights of gases

Molecular weight of gases=32

Molecular weight of gas mixture=

100

(10×32+90×M)

=3.2+9×M

We know that

r

mixture

r

oxygen

=

M

oxygen

M

mixture

75

86

=

32

3.2+0.9×M

M=46.75gm

Answer 2

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