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We put a mixture of helium, oxygen and nitrogen gases in a closed container at 25...

We put a mixture of helium, oxygen and nitrogen gases in a closed container at 25 ° C. Container pressure in this case is 300 kPa. By a process, we remove all helium gas in the mixture from the closed container. Container pressure in this case reaches 250 kPa. What percentage of the gas mixture did the initial mixture of helium molecules contain? If there are 14 grams of nitrogen and 32 grams of oxygen in this container, what is the mass of the helium gas and the volume of the closed container?
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