10_Ch10_2 - In using the ideal gas law the identity of the...

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Mary J. Bojan Chem 110 In using the ideal gas law the identity of the gas has not been a concern . Does it work with a 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: : 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: Χ i " i = P i P TOT = n i n TOT 2
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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? P TOT = 756 TORR GAS MOLE FRACTION T = 300.0 ° C Ar 0.320 V TOT =5.00 L N 2 0.270 CO 2 0.150 Ne 0.160 O 2 ? 1. 75.6 torr 2. 378 torr 3. 680 torr 4. 756 torr 5. There is not enough data. 4
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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). ppm = x i × 10 6 6 If you know the barometric pressure, you can determine the partial pressure. P BAR = 0.987 atm= P TOT P Ne = x Ne P TOT = 18.18 × 10 -6 ( 0.987 atm) = 17.94 × 10 -6 atm
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Chem 110 Collecting Gas over water Example: During a reaction, N 2 is collected over H 2 O. P
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10_Ch10_2 - In using the ideal gas law the identity of the...

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