Can someone help me to answer this correctly, please, and explain it. Please answer these 2 short questions, I don't have more money to buy more questions. These 2 questions are different.

1. a.

1. b.

In the laboratory you dissolve 19.9g of ammonium bromide in a volumetric flask and add water to a total volume of 375mL. What is the molarity of the solution? M. What is the concentration of the ammonium cation? M. What is the concentration of the bromide anion? M. In the laboratory you dissolve 23.4g of calcium nitrate in a volumetric flask and add water to a total volume of 250 mL. What is the molarity of the solution? M. What is the concentration of the calcium cation? M. What is the concentration of the nitrate anion? M