A balloon contains 0.76 mol n2, 0.18 mol o2, 0.031 mol he and 0.026 mol h2 at 749 mm hg. what is the partial pressure (in mm hg) of o2? give a numeric answer only, no units.

Question

Chemistry

Mariah Hester

26 May, 15:28

A balloon contains 0.76 mol n2, 0.18 mol o2, 0.031 mol he and 0.026 mol h2 at 749 mm hg. what is the partial pressure (in mm hg) of o2? give a numeric answer only, no units.

+5

Answers (1)

Know the Answer?

Meredith James · Answer 1

To keep simplicity, let's assume these gases behave ideally so we can use the equations for ideal gas. One of these equation is the Raoult's Law written below.

P * = xP

This is another form of the Raoult's Law where x is the mole fraction. Let's find x for O2.

x = 0.18 / (0.76+0.18+0.031+0.026) = 0.1805

Partial Pressure = (0.1805) (749 mmHg) = 135.23 mmHg