Answer:
3.5 M
Step-by-step explanation:
The molar concentration of a solution is the number of moles of solute (in this case, NaCl) per liter of solvent (in this case, the solution as a whole). To find the molar concentration of the solution, you need to divide the number of moles of NaCl by the volume of the solution in liters.
In this case, the molar concentration of the solution is:
molar concentration = (7.0 mol NaCl) / (2 L) = 3.5 M
This means that the solution has a molar concentration of 3.5 moles of NaCl per liter of solvent.