Answer:
6 moles of NaCl are needed to make 3.0 liters of a 2.0 M NaCl solution.
Step-by-step explanation:
A 2M solution means that there are 2 moles of solute (NaCl in this case) in 1 liter of solution:
1 L solution-----2 moles of NaCl
3 L solution----x= (3 L solutionx2 moles of NaCl)/1 L solution= 6 moles of NaCl