How many grams (g) of NaCl do you need to make 95.9 mL of a 2.9 M NaCl solution?

Question

How many grams (g) of NaCl do you need to make 95.9 mL of a 2.9 M NaCl solution? 

Answer 1

What is a 2.9 M solution of NaCl?  It means there are 2.9 MOLES of NaCl in 1 LITER of solution.

So, next, how many grams are in 2.9 moles of NaCl?

1 mole NaCl = 58.5 g (Na=23 and Cl=35.5). 

2.9 moles NaCl = 2.9 moles x 58.5 g/mole = 169.65 g of NaCl

But since you don't need 1 liter, but you need only 95.9 ml (0.0959 liter), you need only a fraction of this amount.

So, to adjust for making only 0.0959 liters, you have...

169.65 g/Liter x 0.0959 Liters = 16.3 g = 16 g NaCl needed to make 95.9 ml of 2.9 M NaCl solution (to 2 sig. figs.)