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Standard XII

Chemistry

Introduction to Le Chatelier's Principle

The volume of...

Question

The volume of 0.0618 mol of O2 obtained by decomposition of KCLO3 and collected by displacement of water of 428 ml at a pressure of 754 mmHg at 25 celsius. The pressure of water vapour at 25 celsius

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Q. Oxygen gas generated by the decomposition of potassium chlorate is collected. The volume of oxygen collected at

24^{o} C

and atmospheric pressure of 760 mmHg is 128 mL. Calculate the mass (in grams) of gas obtained. The pressure of the water vapour at

24^{o} C

is 22.4 mmHg.

Q. Oxygen gas generated by the decomposition of potassium chlorate is collected. The volume of oxygen collected at

24^{0} C

and the atmospheric pressure of 760 mmHg is 128 mL. Calculate the mass (in grams) of oxygen gas obtained. The pressure of the water vapor at

24^{0} C

is 22.4 mmHg.

Q. A sample of hydrogen is collected by water displacement in the laboratory .The volume of the sample of hydrogen is 25

m L

at 24.0

^{\circ} C

and barometric pressure for the day of 758

m m H g

. Find the pressure of the dry gas at this temperature ?

(The vapor pressure of water at 24.0

^{\circ} C

is 22.4

m m H g

The vapour pressure of water at 20 degree celsius is 17.54 mmHg. What will be the vapour pressure of the water in the apparatus shown after the piston is lowered, decreasing the volume of the gas above the liquid to one half of its initial volume (assume temperature constant).

A) 8.77 mmHg

B)17.54mmHg

C)35.08 mmHg

D) between 8.77 and 17.54mmHg

Q. The vapor pressure of pure water at

25

degrees Celsius is

23.8

torr. What is the vapor pressure of a solution prepared by dissolving

18.0 g

of glucose (molecular weight =

180.0 g / m o l

) in

95.0 g

of water?

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