Answer:
0.877 mol
Step-by-step explanation:
We can use the Ideal Gas Law to solve this problem.
pV = nRT Divide both sides by RT
n = (pV)/(RT)
Data:
p = 646 torr
V = 25.0 L
R = 0.082 06 L·atm·K⁻¹mol⁻¹
T = 22.0 °C
Calculations:
(a) Convert the pressure to atmospheres
p = 646 torr × (1 atm/760 torr) = 0.8500 atm
(b) Convert the temperature to kelvins
T = (22.0 + 273.15) K = 295.15 K
(c) Calculate the number of moles
n = (0.8500 × 25.0)/(0.082 06 × 295.15)
= 0.877 mol