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Selina Solutions Class 9 Chemistry Solutions for Exercise Number Problems in Chapter 7 - Chapter 7 Study Of Gas Laws

Question 25 Number Problems

Which will have greater volume when the following gases are compared at S.T.P

a) 1.2 l N2 at 25oc and 748 mm Hg

b) 1:25 l O2 at S.T.P

Answer:

a)

V = 1.2 litres

P = 748 mmHg

T = 298 K

P1 = 760 mmHg

T1 = 273 K

V1=?

PV/T = P1V1/T1

748 x 1.2 /298= 760 x V1/273

V1 = 1.081 litres

b)

V = 1.25 litres

P = 760 mmHg

T = 273 K

P1 = 760 mmHg

T1 = 273 K

V1= ?

PV/T = P1V1/T1

760 x 1.25/273 = 760 x V1/273

V1= 1.25 litres

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