Question

what is the percent by mass of NaCHO3 in a solution containing 12g NaCHO3, dissolved in 450mL of water?

Answer 1

Density=mass/volume

Density of H2O= 1g/mL, solve for mass in g

400ml*(1g/mL)= mass of H2O

[12 g of NaCHO3/(mass of H2O + mass of NaCHO3)]*100= % mass of NaCHO3