What does 0.053 M NaCl mean? How many grams of sodium chloride are needed to make 5.0 liters of this solution?

Answer 1

0.053M means you have 0.053 mols NaCl/Liter of solution.
Since M = mols/L you can rearrange that to M x L = mols and 0.053 x 5L = ? mols in 5L of solution.
If you want to convert that to grams it is
grams = mols x molar mass = ?

Answer 2

grams would = 15.4866?

.053x5 = .265
molar mass of NaCl = 58.44 (Na=22.99 + Cl=35.45)
.265x58.44 = 15.4866...

I think I did this correctly, if I did not please let me know where I went wrong. Thank you

Answer 3

Yes, except you have too many places in yur answer. You are allowed only two places (from the 0.053 which has two significant figures and the 5.0 has two s.f.). Therefore, you should round the final answer to two s.f. and that would be 15.(written 15. or 1.5E1).