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The volume of oxygen collected by the de...

The volume of oxygen collected by the decomposition of potassium chlorate at `24^(@)C` and atmospheric pressure of 760 mm Hg is 128 mL. Calculate the mass of oxygen gas obtained. The pressure of the water vapour at `24^(@)C` is `22.4 mm Hg`.

A

0.123 g

B

0.163 g

C

0.352 g

D

1.526 g

Text Solution

Verified by Experts

The correct Answer is:
B
From the total pressure and the vapour pressure of water , we can calculate the partial pressure of `O_(2)`
`P_(O_2) = P_(T) - P_(H_(2) O) = 760 - 22.4= 737.6` mm Hg
From the ideal gas equation we write `w = (pVM)/(RT) = (0.9705 xx 0.128 xx 32.0)/(0.0821 xx 297) = 0.163`
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