1) Our atmosphere is 78% nitrogen and 21% oxygen. If you travel to the top of a

Question

1) Our atmosphere is 78% nitrogen and 21% oxygen. If you travel to the top of a mountain where the total atmospheric pressure is 0.8 atmospheres, what will the partial pressure of oxygen be there? (Give your answers in atmospheres, expressed to the nearest hundredth).

2) If there is a lake at the top of the mountain in question 1, what is the partial pressure of oxygen in the water of the lake? (Assume all molecules are at equilibrium.) Give your answer in atmospheres, rounded to the nearest hundredth.

3) If the lake water in question 2 has an absorption coefficient for oxygen of 2, approximately how many millimoles of oxygen will dissolve in the water?

Explanation / Answer

Ans 1 partial pressure of o2/toal pressure = fraction of o2 in air

Po2/0.8 =0.21

Po2 = 0.168 atm

in other question percentage of o2 is not given

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