### Gas Law Problems- Dalton's Law

```Abbreviations				Conversions
atm - atmosphere			K  =  °C  +  273
mm Hg - millimeters of mercury		1 cm3 (cubic centimeter)  =  1 mL (milliliter)
torr - another name for mm Hg		1 dm3 (cubic decimeter)  =  1 L (liter)  =  1000 mL
Pa - Pascal (kPa  =  kilo Pascal)	Standard Conditions
K - Kelvin				0.00 °C  =  273 K
°C - degrees Celsius			1.00 atm  =  760.0 mm Hg  =  101.325 kPa  =  101,325 Pa
```

The vapor pressure of water in kilopascals is here. Remember to convert to mmHg or atm. as needed.

65. A container holds three gases: oxygen, carbon dioxide, and helium. The partial pressures of the three gases are 2.00 atm, 3.00 atm, and 4.00 atm, respectively. What is the total pressure inside the container?

66. A container with two gases, helium and argon, is 30.0% by volume helium. Calculate the partial pressure of helium and argon if the total pressure inside the container is 4.00 atm.

67. If 60.0 L of nitrogen is collected over water at 40.0 °C when the atmospheric pressure is 760.0 mm Hg, what is the partial pressure of the nitrogen?

68. 80.0 liters of oxygen is collected over water at 50.0 °C. The atmospheric pressure in the room is 96.00 kPa. What is the partial pressure of the oxygen?

69. A tank contains 480.0 grams of oxygen and 80.00 grams of helium at a total pressure of 7.00 atmospheres. Calculate the following.

a) How many moles of O2 are in the tank?
b) How many moles of He are in the tank?
c) Total moles of gas in tank.
d) Mole fraction of O2.
e) Mole fraction of He.
f) Partial pressure of O2.
g) Partial pressure of He.

70. A tank contains 5.00 moles of O2, 3.00 moles of neon, 6.00 moles of H2S, and 4.00 moles of argon at a total pressure of 1620.0 mm Hg. Complete the following table

```			O2	Ne	H2S	Ar	Total
Moles							18.00

Mole fraction						1

Pressure fraction					1

Partial Pressure					1620.0
```

71. A mixture of 14.0 grams of hydrogen, 84.0 grams of nitrogen, and 2.0 moles of oxygen are placed in a flask. When the partial pressure of the oxygen is 78.00 mm of mercury, what is the total pressure in the flask?

72. A flask contains 2.00 moles of nitrogen and 2.00 moles of helium. How many grams of argon must be pumped into the flask in order to make the partial pressure of argon twice that of helium?