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The partial pressure of ?2 O 2 in air in Victoria is only 0.20 atm at...

The partial pressure of ?2 O 2 in air in Victoria is only 0.20 atm at 20oC. Which of the following gases makes up most of the remaining 0.80 mole fraction of air?

a. ?2?

b. ??2

c. ??

d. ?2

e. ??

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