SOLUTION: A mixture of nitrogen,oxygen,and helium contains 0.25 ,0.15 and 0.4 respectively if d pressure cionsituted by oxgen is 2.5 atmosphere find partial pressure of helium?

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Question 983122: A mixture of nitrogen,oxygen,and helium contains 0.25 ,0.15 and 0.4 respectively if d pressure cionsituted by oxgen is 2.5 atmosphere find partial pressure of helium?
Answer by KMST(5328) About Me  (Show Source):
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Where are the units for 0.25 ,0.15 and 0.4?

If a mixture of nitrogen, oxygen, and helium contains 0.25, 0.15 and 0.4 highlight%28moles%29 respectively,
and the partial pressure of oxygen is 2.5 atmosphere,
then the partial pressure of helium is %280.4mol%2F%220.15+mol%22%292.5atmospheres=6.7atmospheres {rounded to a reasonable number of significant digits).

If the mixture of nitrogen, oxygen, and helium contains 0.25, 0.15 and 0.4 highlight%28liters%29 respectively,
the answer is 6.7atmospheres too.

If the mixture of nitrogen, oxygen, and helium contains 0.25, 0.15 and 0.4 highlight%28grams%29 respectively,
then the number of moles is
0.15g%281mol%2F%2232+g%22%29=0.0047mol for oxygen, and
0.4g%281mol%2F%2220+g%22%29=0.02mol for helium,
and the partial pressure of helium is
%280.02mol%2F%220.0047+mol%22%292.5atmospheres=10.7atmospheres