Question

A gas occupies 700ml at S. T. P. Find the volume occupied by it when the pressure is 400mm of Hg and it's temperature is 15°C

Answer 1

p1=40mm

p2= 760mm(at S.T.P)

v1=700ml

v2=?

t1=15°c. = 15+273=288°k

t2= 0°c. = 0+273=273°k

=

$\frac{p1 \times v1}{t1} = \frac{p2 \times v2}{t2}$

$\frac{40 \times 700}{288} = \frac{760 \times v2}{273}$

$972.223 = \frac{760 \times v2}{273}$

$\frac{265416.879}{760} = v2$

Answer 2

Use combined gas eqn.

p1v1/T2=p2V2/T2

here P1=1 bar=760mm of Hg

T1=273k

Here you have to calculate V2.

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