NCERT Class XI Chemistry States of Matter Solutions

Question : 4

Total: 23

At 0°C, the density of a certain oxide of a gas at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?

Solution:

Moxide =

doxideRT

Poxide

... (1)
MN2 =

dN2RT

PN2

... (2)
Dividing equation (1) by equation (2) gives

Moxide

MN2

doxideRT×PN2

Poxide×dN2

But doxide = dN2
∴ Moxide =

5‌bar

2‌bar

× 28 gmol−1 = 70 gmol−1

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