Calculate the molarity of each.

Question

a. 1.50 mole of NaCl in 8.00 L of solution

0.188 M NaCl

b. 270 mg of NaCl in 3.00 mL of solution

90 M NaCl

Answer 1

I agee with a but not b.
b)
270 mg = 0.270g
mols = 0.270/58.44 = about 0.005
M = moles/L = about 0.005/0.003 = ?