How many moles of NaCl are required to make a 0.15 M solution from 175 mL of water?

Question

A. 0.008 mol

B. 0.026 mol

C. 0.850 mol

D. 26.25 mol

Answer 1

0.15 moles / 1 L * 1 L / 1000 mL * 175 mL

= 0.026 moles NaCl

Another way to think of this is proportions

If 1 L of solution contains 0.15 moles of NaCl

then 175 mL (0.175 L) will contain 175/1000 moles of NaCl

which is 0.026 moles NaCl