1. The pressure of a gas changes from 120 kPa to 50 kPa. The volume changes from 45 L to 40 L.
If the initial temperature is 81^{o}C, what is the final temperature in ^{o}C?

2. A sample of nitrogen goes from 21 m^{3} to 14 m^{3}
and its pressure increases from 100 kPa to 150 kPa. The final temperature is 300 K. What was the initial temperature
in Kelvins?

3. A sample of argon goes from 500 K to 350 K and its pressure changes
from 280 kPa to 380 kPa. If the initial volume is 18 dm^{3}, what is the final volume?

4. A sample
of neon experiences a pressure drop from 75 kPa to 53 kPa. The temperature increases from 27^{o}C to 93^{o}C.
If the initial volume is 12 L, what is the final volume?

5. The volume
of a sample of helium increases from 5 L to 25 L and its temperature drops from 2000 K to 1750 K. If the initial pressure
is 1500 mm Hg, what is the final pressure?

6.
The temperature of a gas increases from 212^{o}C
to 380^{o}C. The volume goes from 30 dm^{3} to 18 dm^{3}. If the final pressure is 1.85
atm, what was the initial pressure?