how much solute are present in a solution that contains 100.0 g water, and 9% by weight sodium bicarbonate?
9% means 9g solute in 100 g SOLUTION so
(x g solute)/(x g solute + 100 g H2O) = 0.09
Solve for x.
(x g solute)/(x g solute + 100 g H2O) = 0.09
Solve for x.