A dehumidifier tank is emptied once a day. If the capacity of the tank is 2 gallons, determine how many molecules of water the dehumidifier collects from the air per millisecond.
(1 quart = 0.94633 liters; 4 quarts = 1 gallon; density of water is 1g/mL; 18 g water = 6.02x10^23 molecules of water)

I'm terrible with Dimensional Analysis!