Homework- Dalton’s Law and Gas Laws(review)
1. Determine the total pressure of a gas mixture that contains oxygen, nitrogen and helium if the partial pressures of the gases are Po2=20.0kPa PN2=46.7kPa and PHe=26.7 kPa. (Answer= 93.4 KPa)
2. Under the same conditions of temperature and pressure, which gas will diffuse faster H2 or CO2? Why? (Answer = H2, lighter, lower mass)
3. An 8.00 L sample of neon gas at 25 C exerts a pressure of 900 kPa. If the gas is compressed to 2.00 L and the temperature is raised to 225 C, what will the new pressure be?(Answer= 6016 kPa)
4. A scientist finds that the air trapped in a tube occupies 24.8 L at 1.12 atm. By adding mercury to the tube, the pressure on the trapped air increases to 2.64 atm. Assuming the temperature is kept constant, what is the new volume of the air? (Answer= 10.5 L)
5. A helium balloon has a volume of 5 L at STP. What will be its new volume if the temperature is increased to 325 K and its pressure is increased to 125 kPa? (Answer=4.82 L)
6. A sample of methane that initially occupies 850 ml at 500kPa and 500 K is compressed to a volume of 700 ml. To what temperature will the gas need to be cooled to lower the pressure of the gas to 200 kPa? (Answer=165 K)
7. 2. A 1.5 L pocket of air with a temperature of 295 K rises in the air. What will be the volume of the air pocket if the temperature is decreased to 275 K and the pressure is not changed? (Answer=1.40 L)
8. There are 24.0 g of helium in a 200 L balloon at a temperature of 23 C. What is the pressure of the helium inside the balloon? (.74 atm)
9. What mass of nitrogen gas must be used to fill a 5000 ml flask at a pressure of 750 mm Hg and a temperature of 25 C? (5.65 g)
Homework- Dalton’s Law and Gas Laws(review)
1. Determine the total pressure of a gas mixture that contains oxygen, nitrogen and helium if the partial pressures of the gases are Po2=20.0kPa PN2=46.7kPa and PHe=26.7 kPa. (Answer= 93.4 KPa)
2. Under the same conditions of temperature and pressure, which gas will diffuse faster H2 or CO2? Why? (Answer = H2, lighter, lower mass)
3. An 8.00 L sample of neon gas at 25 C exerts a pressure of 900 kPa. If the gas is compressed to 2.00 L and the temperature is raised to 225 C, what will the new pressure be?(Answer= 6016 kPa)
4. A scientist finds that the air trapped in a tube occupies 24.8 L at 1.12 atm. By adding mercury to the tube, the pressure on the trapped air increases to 2.64 atm. Assuming the temperature is kept constant, what is the new volume of the air? (Answer= 10.5 L)
5. A helium balloon has a volume of 5 L at STP. What will be its new volume if the temperature is increased to 325 K and its pressure is increased to 125 kPa? (Answer=4.82 L)
6. A sample of methane that initially occupies 850 ml at 500kPa and 500 K is compressed to a volume of 700 ml. To what temperature will the gas need to be cooled to lower the pressure of the gas to 200 kPa? (Answer=165 K)
7. 2. A 1.5 L pocket of air with a temperature of 295 K rises in the air. What will be the volume of the air pocket if the temperature is decreased to 275 K and the pressure is not changed? (Answer=1.40 L)
8. There are 24.0 g of helium in a 200 L balloon at a temperature of 23 C. What is the pressure of the helium inside the balloon? (.74 atm)
9. What mass of nitrogen gas must be used to fill a 5000 ml flask at a pressure of 750 mm Hg and a temperature of 25 C? (5.65 g)