Answer:
Step-by-step explanation:
Assuming that the number of moles of helium remains constant and that the temperature does not change, we can use Boyle's Law to determine the new pressure:
P1V1 = P2V2
where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Plugging in the given values, we get:
(500 torr)(100 mL) = P2(250 mL)
Solving for P2, we get:
P2 = (500 torr)(100 mL) / (250 mL)
P2 = 200 torr
Therefore, the new pressure is 200 torr.