2. Practice Problems Gases

3. A 3.0 L. sample of oxygen gas at 25 C And 700. torr is heated to 35 C. The pressure is reduced to.5 atmosphere. What is the new volume? Practice test

4. 3.0 L 308 K.921atm = 5.7 or 6 L 298 K.5atm 700(3.0) 380(v 2 ) 298 308

5. Ideal gas An ideal gas has elastic collisions An ideal gas has particles that have no attraction for each other. An ideal gas has particles that move in continuous random motion. An ideal gas has particles that occupy a theoretical zero volume.(the size of the particles are negligible compared to the distances between them Kinetic energy is proportional to Kelvin temperature

6. Compare 2 containers at the same temperature. Container A has 6 moles of oxygen gas, Container B has 6 moles of hydrogen gas. Expandable container. Compare the number of molecules in each container. Compare the kinetic energies Compare the pressures Compare the volumes Compare the velocities Compare the masses Which gas is more “ideal”?

7. Calculate moles and grams A sample of SO 2 gas has a volume of 20.0 L with a pressure of 200.0 Kpa and a temp. of - 30.0 C.

8. Answer PV=nRt n= PV/RT 1.974atm (20.0L).08206 L atm/mole k (243K) = 1.98 moles SO 2 1.98 moles of SO 2 ( 64 g/mole) = 127grams

9. Grahms law of effusion Calculate the ratio of velocities of CO 2 gas to Xenon gas.

10. 230 ml of gas is put into a container that holds 125 ml. The original pressure was 3.2 atm. What is the final pressure?

11. 3 moles of oxygen and 2 moles of argon are combined in a tank at 40 C and 16 atm of pressure. Calculate the partial pressure of each gas.

12. 450 cm 3 of propane at 10 C is heated to 20C. What is the final volume?

13. 2H 2 + O 2  2H 2 O 4 moles of H 2 produce ___ moles H 2 O 12 moles O 2 produce ___ moles H 2 O 8 L of H 2 produce ____ L H 2 O 8 g H 2 produce ____ g of H 2 O

14. A piece of zinc with a mass of 600 g is added to excess hydrochloric acid. What volume of Hydrogen gas will be produced at STP? At 400K and 2.0 atm of pressure. Volume is? What mass of hydrogen is produced at STP? What mass of hydrogen is produced at 400K, 2.0 atm of pressure and 15L?