Posted by John on Sunday, March 3, 2013 at 7:36am.
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
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