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.
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