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A gas mixture contains oxygen, nitrogen, and helium. the partial pressures are: po2=20.0 kpa, pn2=46.7 kpa and phe=26.7 kpa. What is the total pressure of the gas?

a. 93.4 kpa
b. 2.49 × 104 kpa
c. 6.70 kpa
d. 46.7 kpa