1. (b) Boyle's Law
2. (b) since 76 cmHg = 760 mmHg = 1 atm
3. (d) P & T are directly proportional, Gay-Lussac's Law
4. (c) Charles' Law
5. (a) 200 C is the highest temperature.
6. 192 L; Ideal gas law
7. 2.21 L; Charles' Law
8. 121 mL; combined gas law
9. increase temp increases the kinetic energy which increases the force on the walls. This pushes out the walls which causes the volume to increase.
10. The lighter gas will effuse faster. CO2 effuses 1.73 x faster.
11. Balance chemical equation: MgCO3 + 2 HCl --> CO2 + H2O + MgCl2. The student needs 3.34 g MgCO3 and 0.0792 mol HCl. To account for the CO2 collected being collected over water subtract the vapor pressure of water from the total pressure (99.7-3.2) which gives a new volume of 1.04 L. The dissolving of CO2 would cause the volume of the gas produced to be lower.
