1-a solution is made of by dissolving 1.362g of NaCl in enough water to make 250.0 ml of solution ,what is molarity of this solution????

2-If you are given a bottle which contains 45.0ml of 0.345M potassium sulfate solution ,what mass in grams of potassium sulfate in present in this bottle?

3-Explain in detail how would you prepare a solution 1L of a 0.500M kmno4?