Multiple Choice
What is the molecular formula of a compound that contains 39.0% carbon, 16.0% hydrogen, and 45.0% nitrogen, if 0.1576 g of the compound occupies 125 mL with a pressure of 0.9820 atm at 295.15 K?
7. Gases
The Ideal Gas Law: Molar Mass
Back7. Gases
The Ideal Gas Law: Molar Mass
- Multiple Choice
To identify a homonuclear diatomic gas, a chemist weighted an evacuated flask with a volume of 3.9 L then filled it with the gas at a pressure of 2.00 atm and 29.0 ºC. The chemist then re-weighted the flask and recorded the difference in mass as 8.81 g. Identify the gas.
- Multiple ChoiceCalculate the molar mass for 2.50 g of an unknown gas in a 0.500-L container at a pressure of 735 mmHg and a temperature of 22℃.
- Multiple ChoiceA 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.24 bar. What is the molar mass of the unknown compound?
- Multiple ChoiceA 1.44-g sample of an unknown pure gas occupies a volume of 0.335 L at a pressure of 1 atm and a temperature of 100.0°C. What is the molar mass of the unknown gas?
- Multiple ChoiceA 22.0-g sample of an unknown gas occupies a volume of 11.2 L at STP. What could be the identity of the gas?
- Multiple ChoiceA sample of gas has a mass of 0.311 g. At 55°C, its volume is 0.225 L and its pressure is 886 mmHg. Find its molar mass using the Ideal Gas Law.
- Multiple ChoiceA sample of gas has a mass of 0.565 g. Its volume is 116 mL at a temperature of 87 °C and a pressure of 781 mmHg. Using the Ideal Gas Law, what is the molar mass of the gas?
- Multiple ChoiceAn unknown gas occupies a volume of 1250 mL at 26°C and 705 torr. If the mass is 2.37 g, what is the molar mass of the gas? (R = 0.0821 L·atm/mol·K)
- Multiple ChoiceHelium gas is contained in a tank with a pressure of 11.1 MPa. If the temperature inside the tank is 29.3 °C and the volume of the tank is 16.7 L, determine the mass, in grams, of the helium in the tank using the Ideal Gas Law.
- Multiple ChoiceNitrogen gas is produced in a reaction. If the temperature of the gas is 225.5 K, the pressure is 13.9 MPa, and the volume is 13.0 L, determine the mass of the nitrogen gas in kilograms using the Ideal Gas Law.
- Multiple ChoiceWhat is the mass (in grams) of 10.00 L of propane vapor (C₃H₈) at STP?
- Multiple ChoiceWhat is the molar mass of a gas if a 0.212 g sample takes up a volume of 99.056 mL at 122°C and 1.02 atm pressure?
- Multiple ChoiceWhat mass of helium gas is present in a 14.5 L sample at 273 K and 1 atm, assuming ideal gas behavior? Express your answer in grams.
- Multiple ChoiceWhat volume will 4.70 g of nitrogen gas (N₂) occupy at STP?