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
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