A cylinder contains a mixture of gases: 1.00 moles of Ar, 8.00 g He, and 3.00 moles of H₂. If the total pressure of the system is 5.00 atm, what is the partial pressure of Ar (in atm)?
a) 0.83 atm
b) 1.00 atm
c) 1.67 atm
d) 2.00 atm