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lesantik [10]
2 years ago
9

Oxygen gas generated in the thermal decomposition of potassium chlorate is collected over water. At 24ºC and an atmospheric pres

sure of 762 mm Hg, the volume of gas collected is 0.128 L. The vapour pressure of H2O at 24ºC is 22.4 torr. What is the mass of oxygen collected?
Chemistry
1 answer:
Yanka [14]2 years ago
6 0

Answer:

its 0.163 g

Explanation:

From the total pressure and the vapour pressure of water we can calculate the partial pressure of O2​

PO 2 =P t −P H 2 O

​= 760 − 22.4

=  737.6 mmHg

From the ideal gas equation we write.

W= RT/PVM = (0.0821Latm/Kmol)(273+24)K(0.974atm)(0.128L)(32.0g/mol/) =0.163g

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