What does 1 mol L-1 represent in terms of quantity?

The concentration of 1 mol L^-1, which is also expressed as 1 M, indicates that there is one mole of solute per liter of solution. A mole is a fundamental unit in chemistry that relates to the quantity of substance. One mole of any substance contains exactly 6.02 times 10^23 entities, which could be atoms, molecules, ions, or other particles. This number is known as Avogadro's number.

Therefore, when a solution has a concentration of 1 mol L^-1, it contains 6.02 times 10^23 molecules of solute for every liter of that solution. This is why the correct answer reflects the quantity associated with 1 mol L^-1, showing the direct relationship between moles and the number of molecules in a specific volume of solution.