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Potassium superoxide is used in a breathing unit for a closed room…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Potassium superoxide is used in a breathing unit for a closed room. It takes in the carbon dioxide that people breathe out and gives out oxygen, by . The unit must take in of carbon dioxide. Use the molar masses for KO2, for CO2 and for O2. Find the mass of potassium superoxide that is needed, the mass of oxygen that is released, and the volume of that oxygen at and .
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The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Moles of carbon dioxide. .
Step 2. Superoxide. 4 mol of KO2 take in 2 mol of CO2, so of KO2. The mass is .
Step 3. Oxygen. 3 mol of O2 come from 2 mol of CO2, so . The mass is .
Step 4. Volume. .
Answer: of KO2, of oxygen and .
What if? Sodium peroxide, , gives only 1 mol of O2 for 2 mol of CO2. The superoxide gives three times as much oxygen for each mole of carbon dioxide.
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