Question

1. A sample of methane gas (CH4) at 24.4 oC is either heated or cooled. The pressure increases from 1.21 atm to 3.80 atm, and the volume of the sample changes from 1.02 L to 4.61 L. To what temperature, in oC, was the methane heated or cooled?

2. An effusion container is filled with 5 L of an unknown gas. It takes 321 s for the gas to effuse into a vacuum. From the same container under the same conditions--same temperature and initial pressure, it takes 124 s for 5.00 L of O2 gas to effuse. Calculate the molar mass (in grams/mol) of the unknown gas.

3. Three bulbs are connected by tubing, and the tubing is evacuated. The volume of the tubing is 39.0 mL. The first bulb has a volume of 56.0 mL and contains 5.92 atm of argon, the second bulb has a volume of 250 mL and contains 1.28 atm of neon, and the third bulb has a volume of 37.0 mL and contains 8.50 atm of hydrogen. If the stopcocks (valves) that isolate all three bulbs are opened, what is the final pressure of the whole system in atm?

Answer 1