Question

20 litre Nitrogen gas is poured into Jar A having a capacity of 2 litres. What will be the

volume?
​

Answer 1

Answer:

The mole fraction of nitrogen X

N

2

=

total pressure

partial pressure ofN

2

=

5.75×10

7

torr

742.5 torr

=1.29×10

−5

55.5 moles of water are present in a liter of water. Let n be the number of moles of nitrogen. When n is small, the mole fraction of nitrogen will be X

N

2

=

n+55.5

n

=

55.5

n

Thus,

55.5

n

=1.29×10

−5

The number of moles n=55.5×1.29×10

−5

=7.16×10

−4

mol

At STP, 1 litre of a gas occupies 22.4 L or 22400 ml.

Thus the volume of nitrogen at STP =7.16×10

−4

×22400=16.0 ml.