A mixture of He and O2 is placed in a 4.00 L flask at 32 °C. The partial pressure of?

A mixture of He and O2 is placed in a 4.00 L flask at 32 °C. The partial pressure of the He is 2.7 atm and the partial pressure of the O2 is 1.4 atm. What is the mole fraction of O2?

a. 0.224
b. 0.518
c. 0.341
d. 0.659
e. 0.481

Answer:
mole fraction O2 = 1.4 / 1.4 + 2.7 = 0.341
c.0.341

solution: mole fraction of O2 = partial P of O2/total P
= 1.4atm/ (1.4 +2.7)atm = 0.341

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