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A storage tank contains 15 kg of nitrogen at an absolute pressure of 4.35 atm. What...

A storage tank contains 15 kg of nitrogen at an absolute pressure of 4.35 atm. What will the pressure be if the nitrogen is replaced by an equal mass of CO2 in atm? (Molecular mass of nitrogen and carbon is 28.01u and 44.01u)
How many molecules of carbon dioxide are in the tank?
How much additional carbon dioxide should be added to the tank to regain the original pressure in kg?
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