Question

How many moles of Na2CO3 are in 100.0ml of a 2.0M solution?

Answer 1

M = moles of solute / liters of solution

2.00 M = x / 10.0 L

x = 20.0 mol

Suppose the molarity was listed as 2.0 M (two sig figs). How to display the answer? Like this:

20. mol