# What is the percent by mass of NaHCO_3 in a solution containing 20 g NaHCO_3, dissolved in 600 mL H_2O?

$\text{Approx. 3%}$
"Mass of sodium bicarbonate"/"Mass of sodium bicarbonate solution"xx100%=
(20*g)/(20*g+600*g)xx100%=3.2%(m/m)