Suppose you dump a 5-lb sack of sugar into Bellingham Bay.

Assume the sugar disperses uniformly throughout all of the world’s oceans.

Estimate how many molecules of sucrose would be found in each liter of sea water.

Convert 5 lb into grams. There are 453.6 g in a lb. Then convert to moles. moles = grams/molar mass. Finally, convert moles to # molecules remembering that 1 mol contains 6.022E23 molecules.

Look up the volume of the world's oceans. Convert to L.
Now you have molecules in ?L, convert to molecules in 1L.