Calculate the mass (grams) of NaNO3 required to make 500.0 mL of 0.2 M solution of NaNO3

Calculate the molarity (to at least three significant digits) of a solution created when 108 mL of a 1.3-M NaCl solution is added to 100. mL of a 2.2-M NaCl solution.

Calculate the mass (in g) of NaCl needed to make 100.0 mL of a 1.54 M solution (to 3 sig figs).

Suppose 8.29 g of sodium bromide is dissolved in 200. ml. of a 0.50 M aqueous solution of potassium carbonate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the sodium bromide is dissolved in it. Round your answer to 3 significant digits.