what is the molarity in 650.ml of solution containing 63 grams of NaCl?

Question

i dont know how to do it can you guys please help me 

Answer 1

Molarity (M) is defined as moles of solute per liter of solution.  So, find the moles; find the liters, and divide to get M.

moles of NaCl = 63 g x 1 mole/58.4 g = 1.079 moles NaCl

liters of solution = 650.0 ml x 1 L/1000 ml = 0.6500 liters

Molarity (M) of NaCl = moles/liters = 1.079 moles/0.6500 liters = 1.66 molar = 1.7 M (to 2 significant figures)