Question

26. Calculate the volume of dry air at S.T.P. that occupies 28 cm3 at 14°C and 750 mm Hg pressure when saturated with water vapour. The vapour pressure of water at 14°C is 12 mm Hg

27. L.P.G. cylinder can withstand a pressure of 14.9 atmosphere. The pressure gauge of the cylinder indicates 12 atmosphere at 27°C. Due to a sudden fire in the building the temperature rises. At what temperature will the cylinder explode.

28. 22.4 litres of a gas weighs 70 g at S.T.P. Calculate the weight of the gas if it occupies a volume of 20 litres at 27°C and 700 mm Hg of pressure.

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these are the gas laws :-
class 9 ​

Answer 1

Answer:

25.9

Explanation:

26.P1​V1/T1​​=​P2​V2/T2​​

Here, P1​=750−12=738mm,

V1​=28cm^3,

T1​=14+273=287K,

P2​=760mm,

T2​=273K

Then, V2​=738×28×273/287×760​=25.9cm^3