A mixture of helium, argon and krypton is made and stored in a cylinder at a total pressure of 2.80 atm. The partial pressure of helium is 900 torr, and that of argon is 250 torr. What is the partial pressure of krypton in the mixture?
A)1.18 atm
B)1.51 atm
C)1150 torr
D)978 torr

Question

Quizplus · Accepted Answer

The total pressure in the mixture is the sum of the partial pressures of all gases present. First, convert the given pressures to the same units. 1 atm = 760 torr. The total pressure is 2.80 atm, which is 2.80 * 760 = 2128 torr. The partial pressures of helium and argon are 900 torr and 250 torr, respectively. Subtracting these from the total gives the partial pressure of krypton: 2128 torr - 900 torr - 250 torr = 978 torr.

A Mixture of Helium, Argon and Krypton Is Made and Stored