Verified Answer :

Billymkhoi

The number of moles of NaCl(s) needed to make 3.0 L of a 2.0 M NaCl solution (soln) is:
3.0 L NaCl soln* (2.0 mol NaCl/ 1L NaCl soln)= 6.0 mol NaCl.

Therefore, (3) 6.0 mol is the correct answer.

Hope this helps~

The total number of moles of NaCl needed to make 3 liters of a 2.0 M NaCl solution is equal to 6.0 mol (3).

First, to calculate the concentration of a solution it is necessary to use the following expression:

                                           \(C = mol/vol\)

So, just add the given values ​​and find the required amount of mole:

 

                                         \(2 = x/3\)

                                       \(x = 6 moles\)

Thus, 6 mol of NaCl are needed to create a 3 liter solution with 2 M (moles per liter) concentration.

Learn more about mole calculation in: brainly.com/question/15693285

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