so i have this mini quiz thing and im really confused

i need to show work i've gotten 2 of 7

so if you can show me how you did it it would be great

we need to assume like 1 liter of solution or 1 kg of it x]

1. i did it

2. a sodium chloride solution has a molarity of 1.250 mol/L and a density of 1.050g/ml. calculate molality, the mole fraction of water, and the percent by mass of sodium chloride.

3. a solution of potassium nitrated has a molality of .00350 mol/kg and a denisty of 1.009g/ml. calculate the mole fraction of potassium nitrate and the molarity.

^ i got the molarity already

4. one gram of sodium nitrate was dissolved in 100.0 ml of water. the new volume of this solution is 100.1 ml. the density of water is 1.00 g/ml. calculate the molarity, molality, mole fraction of water and the density of this new solution

5.the molarity and molality of a potassium chloride solution are 1.00mol/l and .9750 mol/kg,respectively. calculate the solution's density.

6. ten (10.00) grams of sodium chloride are dissolved in enough water to give you 100.0 ml of solution. one millilter of this new solution is added to enough water to give you a new volume of 110.0 ml. what is the molarity of this new solution?

7. i got it

i would love it if someone helped x]