10_Ch10_2

# 10_Ch10_2 - Mixture of gases Mix 5 moles of CO2 2 moles of...

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Mary J. Bojan Chem 110 Mixture of gases Mix 5 moles of CO 2 V = 40L 2 moles of N 2 T = 0 ° C 1 mole of Cl 2 What is P ? 1

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Mary J. Bojan Chem 110 Partial Pressure Partial pressure : the pressure a gas would have if it was the only gas in the container. Dalton’s Law of Partial Pressures Total pressure is equal to the sum of partial pressures . The fraction of the total pressure contributed by each gas is equal to its mole fraction: ! I 2
Mary J. Bojan Chem 110 Sample Problem 3.0L of He at 5.0 atm and 25 ° C is combined with 4.5 L of Ne at 2.0 atm and 25 ° C at constant T into a 10L vessel. What is the partial pressure of the He in the 10L vessel? 3 What is the total pressure in the 10L vessel?

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Mary J. Bojan Chem 110 Sample Problem What is the partial pressure of O 2 in the vessel? 1. 75.6 torr 2. 378 torr 3. 680 torr 4. 756 torr 5. There is not enough data. 4
Mary J. Bojan Chem 110 Composition of the atmosphere mole fraction: N 2 and O 2 represent > 99% of atm 5 x i = moles of i total moles

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Mary J. Bojan Chem 110 Composition of the atmosphere Eg. Neon x Ne = 0.00001818 Ne concentration = 18.18 ppm For other components use parts per million (ppm).
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