Question

A student needs 500 mL of a 1.5 M solution of NaCl for an experiment. How many moles of NaCl should she use?

Answer 1

She should use 0.75 mol.

Step-by-step explanation:

By definition, molarity (M) is the number of moles of solute per liter of solution. One liter of solution is equal to 1000 mL.

Therefore,

1000 mL -------- 1.5 moles of NaCl

500 mL --------- x= 0.75 moles of NaCl

The moles contained in 500 mL of a 1.5 M NaCl solution are 0.75.