need help please!!

16. How many of NaCl should you use to make of a solution 17. How many of calcium chloride (FW-111 g/mol) should you use to make 50 ml of a 5 M solution? 18. If you have weighed out 5.84 g of NaCl, what would be the total volume of a 1.0 M solution? 19. How much NaCl should you use to make 250 ml of a 5% solution? 20. If you dissolve 37 mg of NaCl in a total volume of 25 ml, what is the molar concentration? 21. If you dissolve 5.84 g of NaCl in a total volume of 37 ml, what is the molar concentration