# Question 1864b

$0.020 \text{mol NaCl}$
The molarity of a solution is how many moles of solute per liter of solution. Since there are $0.1000 \text{L}$ of a $0.20 \text{M}$ solution, there are (0.1000"L")(0.20"mol/L")=0.020"mol"# of solute.