Question

How many gallons of water are in the Arctic Ocean?

Answer 1

14,056,000 sq km. 1,000,000 sq m per sq km of course.
Average Depth 1,038 meters (I can’t believe this number can be calculated to 4 significant figures but ok
Gallons per Cubic meter. 264.172
Multiply them all and you get 3.921 Quintilian gallons
About 8.5 pounds per gallon of Seawater
So about 33 Quintilian Gallons or 16–17 Quadrillion tons. 15–18 might be a better range

Answer 2

4.953 quintillion gallon .............