How do you convert #"4.5 gal"# to #"L"#? How about to #"mL"# ?
You need to use two simple conversion factors for this one.
In order to go from gallons to liters you need to use a conversion factor. More precisely, you need to use the fact that 1 gallon is the equivalent of 3.78541178 L.
This means that 4.5 gallons will be equal to
The answer is rounded to two sig figs, the number of sig figs you have for 4.5 gallons.
To go from liters to mililiters, use the fact that 1 liter contains 1000 mililiters.