Chem Problem: Oil spreads on water to form a film about 120 nm thick....?

Question

How many square kilometers of ocean will be covered by the slick formed when two barrels of oil are spilled? (1 barrel= 31.5 gallons) (1 liter= 1 decimeter^3) (1 liter or 1 decimeter^3= 1.057 quarts)...... SHOW ALL WORK AND STEPS NOT JUST AN ANSWER.

Answer 1

you set the volume of the spill = to the volume of 2 barrels of oil.
the spill volume = the barrel volume
area x 120nm = 63 gallons x 4.228 liters/gal / 1000 liters/cubic meter
rearrange to
area = (63 x 4.228) / (1000 x .000000120)