3. The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held

constant. How does the gas pressure change?

The new pressure is 8 times the original pressure.

Explanation:

Data obtained from the question include:

Initial volume (V1) = 4L

Final volume (V2) = 0.5L

Initial pressure (P1) = P

Final pressure (P2) = ... ?

The new pressure can be obtained by using the Boyle's law as shown below:

P1V1 = P2V2

P x 4 = P2 x 0.5

Divide both side by 0.5

P2 = P x 4 / 0.5

P2 = 8P

Therefore, the new pressure is 8 times the original pressure.