Question

Partial pressure calculation:
Oxygen gas generated in the decomposition of potassium chlorate is collected over water. The volume of the gas collected at 24 C and atmosphere pressure of 762 mmHg is 128 ml. Calculate the mass of oxygen obtained. The pressure of the water vapor at 24 C is 22.4 mmHg.

Answer 1

I found partial pressure of O2 first and plugged into the ideal gas equation to find the moles of O2. Then I mult that value by the molar mass of O2 to get 0.164 g O2.
Not sure though, can someone confirm please?

Answer 2

Yes, you can do that. Remember that you have \(\sf \color{blue}{P} = \color{green}{\frac{nRT}{V}}\)