8. Consider the following reaction:
2 Al(s) + 3 S (g) → Al2S3 (S)
3.66 g of Al(s) is placed in a 7.46 L cylinder in an atmosphere of S(g) at 1.75 atm and a
temperature of 160. °C. Two minutes later, the pressure has dropped to 1.21 atm and the
temperature had dropped to 120. °C.
a. Calculate the mass of Al(s) left unreacted.
