The combustion of propane (C3H8) produces CO2 and H2O : C3H8 (g) + 5 O2 (g) = 3 CO2 (g) + 4 H2O (g)
How many moles of H2O be produced from the combustion of 5.5 moles of O2 ?
a. 2.1 mol
b. 4.4 mol
c. 5.5 mol
d. 8.6 mol

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.