Question

A mixture of Ar, He, and O2 has a total pressure of 1,015 kPa. Argon exerts a partial pressure of 152 kPa and Helium exerts a partial pressure of 305 kPa. What is the partial pressure of oxygen in this mixture?

a.1,472 kPa
b.558 kPa
c.863 kPa
d.710 kPa

Answer 1

This one is easy. It's just addition and subtraction. Add the partial pressure of Argon and the partial pressure of Helium:
152 kPa
+305 kPa
457 kPa

Next, subtract the result from the total pressure:

1015 kPa
- 457 kPa
558 kPa