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Oxygen gas generated by the decompositio...

Oxygen gas generated by the decomposition of potassium chorate is collected over water. The volume of wxygen collected at `24^(@)C` and atmospheric pressure of 760 mmHg is 128 mL. Calculate the mass of oxygen gas obtained. The pressure of the water vapour at `24^(@)C` is 22.4 mmHg.

A

`1.36`

B

`1.52g`

C

`0.163g`

D

`1.63g`

Text Solution

Verified by Experts

The correct Answer is:
C
From the total pressure and the vapour pressure of water we can calculate the partial pressure of `O_(2)`.
`P_(O_(2))=P_(tau)-P_(H_(2)O)`
`=660-22.4`
`=737.6mm Hg`
From the ideal gas equation we write.
`m=(PVM)/(RT) =((0.974atm)(0.128L)(32.0g//mol))/((0.0821Latm//Kmol)(273+24)K)=0.163g.`
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