# A container holds three gases: helium, argon, and xenon. The partial pressures are 0.450 atm helium and 0.350 atm argon. The total pressure is 3.00 atm. What is the partial pressure of xenon?

##### 2 Answers

The sum of the partial pressures is equal to the total pressure.

**Given/Known:**

**Unknown:**

**Solution:** Determine the sum of the partial pressures of helium and argon, then subtract the sum from the total pressure.

The sum of the partial pressures of He and Ar = 0.800atm.

partial pressure = total pressure x mole fraction

for He: mole fraction(A)= 0.45/3=0.15atm

for Ar: mole fraction (B)=0.35/3=0.117atm

sum of mole fractions =1

(C)=1-(0.15+0.117)

partial pressure of Xe= 3 x C

=2.199 atm