If the Concentration of Sodium Carbonate in Water Is 12 $\times$

Multiple Choice

If the concentration of sodium carbonate in water is 12.8 ppm,what is the molarity of Na₂CO₃(aq) ? The molar mass of Na₂CO₃ is 106.0 g/mol.Assume the density of the solution is 1.00 g/mL.

A) 8.28 $\times$ 10^-6 M
B) 1.21 $\times$ 10^-4 M
C) 1.36 $\times$ 10^-3 M
D) 0.136 M
E) 0.121 M