AP Chemistryhardmcq1 pt
A rigid tank at constant temperature contains 2.0 mol of N2 and 3.0 mol of O2. If the partial pressure of N2 measures 1.2 atm, what is the total pressure in the tank?
A.2.0 atm
B.1.2 atm
C.5.0 atm
D.3.0 atm
Explanation
Core Concept
Dalton's law states that a gas's partial pressure equals its mole fraction times the total pressure. Nitrogen's fraction is 2.0 divided by 5.0 total moles, or 0.40, so 0.40 times the total pressure equals 1.2 atm, making the total 3.0 atm. As a check, oxygen's 0.60 fraction contributes 1.8 atm, and the parts sum to 3.0 atm. Tank volume never enters once composition and a partial pressure are known.
Correct Answer
D3.0 atm
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