Question

Which solution _0.50 M NaCl or 0.25 M SrCl2_ has a larger concentration when expressed in microgram/ml?

Answer 1

M (NaCl) = 58.44 g/mol

M (SrCl₂) = 158.53 g/mol

1 L of solution 1 contains 0.5 mol or (0.5 x 58.44 = 29.22 g) of NaCl

1 L of solution 2 contains 0.25 mol or (0.25 x 158.53 = 39.63) of SrCl₂

29.22 g/L = 29220 micrograms / mL (NaCl)

39.63 g/L = 39630 micrograms / mL (SrCl₂)

39630 > 29220

So solution 0.25 M SrCl₂ has a larger concentration when expressed in microgram/mL