Answer
T = 501K
Work Step by Step
We first need to convert the given P = 8.76 x 10^2 torr into atm so we can apply the combined gas law.
(8.76x10^2 torr) x (1 atm/ 760 torr) = 1.152 atm
By using the combined gas law with the given information and answer from 10.43a,
(1.152 atm)(15 L) = (0.42 mol)(0.08201)(T)
Solve for T = 501K