katiy

A solution contains 1.72 10-3 M Ca(NO3)2. Determine the mass of the Ca2+ ions in 1.8 mL of this solution. How many nitrate ions are there in 3.0 10-6 L (3.0 µL) of this solution? (i keep doing these two wrong but not sure why)

Calculate the concentration in parts per million (ppm) of the solute in each of the following aqueous solutions (a) 0.00500 g of sodium chloride in 850 mL of solution

Calculate the percent by mass of the solute in each of the following aqueous solutions. (a) 5.10 g of NaBr in 78.2 g of solution