1. The pressure of 248.25 g of carbon dioxide gas at 0.00°C is 12.50 atm. What is the volume of the tank in liters? 2. What is the volume in liters, if 12.00 g of methane gas (CH4), at 1650 mm Hg and 348 K?
3. What is the weight of 100.0 liters of helium gas at 150. atm and 50.0°C? Report your weight in grams.
4. A balloon with the volume of 24.0 L and at 23 °C and pressure of 1.00 atm is let go. The balloon after 20 minutes reaches a much higher elevation where due to lower pressure of 0.500 atm is now expands to 28.0 liters. What is the temperature at that elevation in Celsius degrees? [Hint: combined gas law requires temperature input in kelvin and produces results also in kelvin].
5. A 200.0 liter container of nitrogen gas has a pressure 6250 torr. If the container was compressed until its volume become exactly half of what it was, what is the pressure inside the container now in torr? Assume that the temperature remained the same.
6. At STP, how many moles of gas occupy a room with a volume of 6.0 m3? [1 m3 = 1000 L]
8. A ball contains 0.50 moles of nitrogen, 0.20 moles of oxygen and 0.10 moles of carbon dioxide. What percent of the pressure in the ball comes from oxygen? Provide your answer in two significant figures. Do not input the % sign, just the numerical value?
9. When you place a piece of paper with some perfume on it on a table, a few seconds later your friend can smell it when she is sitting several yards away from you. This is due to
(Group of answer choices)

a. effusion of gas particles of perfume molecules into the air
b. diffusion of gas particles of perfume molecules into the air
c. oxygen reacting with the perfume
d. perfume molecules are radioactive