plz help me on my molarity chemistry work..i dont get it and need help even if u

[Maninder B]

know just 1 it would help!!!? 1. calculate the weight of NaOH needed to prepare 1.0 liter of 1.5 molar solution
2. how many grams of HNO3 are used to prepare 2.00 liters of 1.00 molar solution
calculate the mass of solute required in preparing the following:
3. 5 liters of 3M NaOH solution
4. 3.0 liters of 2.0M NaOH
5. 1400 mL of 3.00 NaOH
6. 500 mL of 1.5M NaCl
7. 1200 mL of 0.50M KOH
8. 900 mL of 2.5M H2SO4
9. 1.0 kiloliter of 2.0M MgSO4
10. 3.5 liters of 1.5M HC2H3O2
Calculate the molarity of the following solutions:
11. 1.00 liter which contains 50.0 g NaOH
12. 5 liters which contain 126 g HNO3
13. 1400 mL which conain 120 g HC2H3O2
14. 500 mL which contain 63 g HNO3
15. 1200 mL which contain 100 g NaOH
16. 800 ml which contain 196 g H2SO4
17. 50 mL which contain 3.65 g HCl
18. 1 kilometer which contains 56 kg KOH
19. 1500 mL which contain 168 g KOH
20. 3 liters which contain 240 g NaOH