For the N 2 + H 2 gas mixture:
33
Problem: A physiologist uses an atmosphere consisting of 79% N2, 17% 16O2 , and 4.0% 18O2 by volume. The pressure of the mixture is 0.75 atm . Calc. the mole fraction and partial pressure of 18 O2.
Plan: Since V is proportional to n, the volume% equals the mole%, so dividing volume% by 100 gives X 18O 2 .
Solution: Calculating the mole fraction of 18 O 2 .
Solving for the partial pressure of 18O 2 :
Skill 5-4. Calculating mole fraction and partial pressure of a gas
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