What is the molarity of a 650. ml solution containing 64 grams of nacl?

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 = 64g x 1 mole/58.4 g = 1.095 moles NaCl
liters of solution = 650.0 ml x 1 L/1000 ml = 0.6500 liters
Molarity (M) of NaCl = moles/liters = 1.095 moles/0.6500 liters = 1.68 molar = 1.7 M (to 2 significant figures)

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