Question #83d9a

1 Answer
Ernest Z.
Sep 24, 2014

The partial pressure of helium is 185 Torr.

This problem involves Dalton's Law of Partial Pressures.

For your problem, we can write this as

#P_"total" = P_"CO₂" + P_"Ar" + P_"O₂" + P_"He"#

745 Torr = 135 Torr + 234 Torr + 191 Torr + #P_"He"# = 560 Torr + #P_"He"#

#P_"He"# = 745 Torr – 560 Torr = 185 Torr

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