Question

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?Q141. A container of 5 litre has a gas at pressure of 0.8 m column of Hg. This is joined to an evacuated container of 3 litre capacity. The resulting pressure will be :- (At constant temp.)

(1) 4/3 (2) 0.5 m

(3) 2.0 m (4) 3/4 m

Answer 1

Answer:

Option ( 2 )

Perfectly Explained Below:

Since the temperature is constant, we must use Boyle's Law in this numerical.

Let us identify the information we have :

V1 = 5 litres

P1 = 0.8 m of Hg

V2 = V1 + 3 litres

V2 = 5 litres + 3 litres

V2 = 8 litres

To find : P2

Boyle's law gives the relation between the pressure and volume of a neutral and dry gas which is as follows :

V1 * P1 = V2 * P2

Substituting the values we know,

5 * 0.8 = 8 * P2

=> 4 = 8 * P2

=> P2 = 4 / 8

=> P2 = 0.5 m of Hg

Therefore,

The correct answer is option ( 2 ) .