what is the volume of water needed to make 10M solution of NaCl when using 50 grams of salt?

Answer 1

molar mass NaCl = 58.5 g/mol

10 M = 10 mol/L

50 g NaCl x 1 mol / 58.5 g = 0.855 moles

0.855 mol / x L = 10 mol/L

x = 0.0855 L = 85.5 ml

So, you would need to dissolve the 50 g NaCl in enough water to make a final volume of 85.5 mls. We cannot determine the volume of water needed, since we don't know how much volume 50 g of NaCl occupies. And this answer is not corrected fo significant figures. If it were, you would use 90 mls (1 sig. fig.) of final volume.