Abbreviations Conversions atm - atmosphere K = °C + 273 mm Hg - millimeters of mercury 1 cm^{3}(cubic centimeter) = 1 mL (milliliter) torr - another name for mm Hg 1 dm^{3}(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

73. A gas has a volume of 800.0 mL at minus 23.00 °C and 300.0 torr. What would the volume of the gas be at 227.0 °C and 600.0 torr of pressure?

74. 500.0 liters of a gas are prepared at 700.0 mm Hg and 200.0 °C. The gas is placed into a tank under high pressure. When the tank cools to 20.0 °C, the pressure of the gas is 30.0 atm. What is the volume of the gas?

75. What is the final volume of a 400.0 mL gas sample that is subjected to a temperature change from 22.0 °C to 30.0 °C and a pressure change from 760.0 mm Hg to 360.0 mm Hg?

76. What is the volume of gas at 2.00 atm and 200.0 K if its original volume was 300.0 L at 0.250 atm and 400.0 K.

77. At conditions of 785.0 torr of pressure and 15.0 °C temperature, a gas occupies a volume of 45.5 mL. What will be the volume of the same gas at 745.0 torr and 30.0 °C?

78. A gas occupies a volume of 34.2 mL at a temperature of 15.0 °C and a pressure of 800.0 torr. What will be the volume of this gas at standard conditions?

79. The volume of a gas originally at standard temperature and pressure was recorded as 488.8 mL. What volume would the same gas occupy when subjected to a pressure of 100.0 atm and temperature of minus 245.0 °C?

80. At a pressure of 780.0 mm Hg and 24.2 °C, a certain gas has a volume of 350.0 mL. What will be the volume of this gas under STP

81. A gas sample occupies 3.25 liters at 24.5 °C and 1825 mm Hg. Determine the temperature at which the gas will occupy 4250 mL at 1.50 atm.

82. If 10.0 liters of oxygen at STP are heated to 512 °C, what will be the new volume of gas if the pressure is also increased to 1520.0 mm of mercury?

83. What is the volume at STP of 720.0 mL of a gas collected at 20.0 °C and 3.00 atm pressure?

84. 2.00 liters of hydrogen, originally at 25.0 °C and 750.0 mm of mercury, are heated until a volume of 20.0 liters and a pressure of 3.50 atmospheres is reached. What is the new temperature?

85. A gas balloon has a volume of 106.0 liters when the temperature is 45.0 °C and the pressure is 740.0 mm of mercury. What will its volume be at 20.0 °C and 780 .0 mm of mercury pressure?

86. If the absolute temperature of a given quantity of gas is doubled and the pressure tripled, what happens to the volume of the gas?

87. 73.0 mL of nitrogen at STP is heated to 80.0 °C and the volume increase to 4.53 L. What is the new pressure?

88. 500.0 mL of a gas was collected at 20.0 °C and 720.0 mm Hg. What is its volume at STP?

89. A sample of gas occupies 50.0 L at 15.0 °C and 640.0 mm Hg pressure. What is the volume at STP?

90. A gas is heated from 263.0 K to 298.0 K and the volume is increased from 24.0 liters to 35.0 liters by moving a large piston within a cylinder. If the original pressure was 1.00 atm, what would the final pressure be?

91. The pressure of a gas is reduced from 1200.0 mm Hg to 850.0 mm Hg as the volume of its container is increased by moving a piston from 85.0 mL to 350.0 mL. What would the final temperature be if the original temperature was 90.0 °C?

92. If a gas is heated from 298.0 K to 398.0 K and the pressure is increased from 2.230 x 10^{3} mm Hg to 4.560 x 10^{3} mm Hg what final volume would result if the volume is allowed to change from an initial volume of 60.0 liters?

Combined Gas Law which requires Dalton's Law also

IMPORTANT NOTE: A gas collected over water is always considered to be saturated with water vapor. The vapor pressure of water varies with temperature and must be looked up in a reference source.

93. 690.0 mL of oxygen are collected over water at 26.0 °C and a total pressure of 725.0 mm of mercury. What is the volume of dry oxygen at 52.0 °C and 800.0 mm pressure?

94. 400.0 mL of hydrogen are collected over water at 18.0 °C and a total pressure of 740.0 mm of mercury.

a) What is the partial pressure of H_{2}?

b) What is the partial pressure of H_{2}O?

c) What is the volume of DRY hydrogen at STP?

95. 45.0 mL of wet argon gas is collected at 729.3 mm Hg and 25.0 °C. What would be the volume of this dry gas at standard conditions?

96. 19.1 L of He gas is collected over water at 681.3 mm Hg and 18.5 °C. What would be the volume of this dry gas at standard conditions?

97. 407 mL of H_{2} gas is collected over water at 785.3 mm Hg and 23.5 °C. What would be the volume of this dry gas at standard conditions?

98. 93.0 mL of O_{2} gas is collected over water at 0.930 atm and 10.0 °C. What would be the volume of this dry gas at standard conditions?

99. 6.12 L of wet xenon gas is collected at 2.00 x 10^{5} Pa and 80.0 °C. What would be the volume of this dry gas at standard conditions?

100. A sample of oxygen collected over water when the atmospheric pressure was 1.002 atm and the room temperature, 25.5 °C occupied 105.8 mL. What would be the volume of this dry gas at standard conditions?

101. 1.000 L of hydrogen gas is collected over water at 30.0 °C at a pressure of 831.8 mm Hg. Find the volume of dry hydrogen collected at STP.

102. 50.6 mL of a gas is collected over water at 18.0 °C and 755.5 mm Hg pressure. What is the volume of dry gas at STP?

103. Write the combined gas law in equation form. Solve the combined gas law for V_{2}.