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Oxygen gas generated by the decompositio...

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

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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Knowledge Check

  • A sample of hydrogen was collected over water at 21^(@)C and 685mm Hg. The volume of the container was 7.80 L. Calculate the mass of H_(2)(g) collected (vapour pressure of water = 18.6 mm Hg at 21^(@)C )

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    B
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