A mixture contains 2 mol N 2 and 3 mol O 2 at a total pressure of 10 atm. What is the partial pressure of O 2 ?

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A mixture contains 2 mol N2 and 3 mol O2 at a total pressure of 10 atm. What is the partial pressure of O2?

Answer: 6 atm.

A 2 atm
B 4 atm
C 6 atm
D 10 atm

Correct answer: C. 6 atm

Explanation: Mole fraction of O2 = 3/5 = 0.6. Partial pressure = 0.6 x 10 = 6 atm.

Graph of pressure versus volume for a fixed amount of gas at constant temperature: the curve falls steeply then flattens, a hyperbola showing pressure inversely proportional to volume.

Boyle's law: at constant temperature the pressure of a fixed mass of gas is inversely proportional to its volume (P ∝ 1/V), so the P–V plot is a hyperbola — halving the volume doubles the pressure. Image: Reginaprice2013, CC BY-SA 3.0, via Wikimedia Commons.

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A mixture contains 2 mol N<sub>2</sub> and 3 mol O<sub>2</sub> at a total pressure of 10 atm. What is the partial pressure of O<sub>2</sub>?

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