Which of the following best describes the initial concentration (m) of sodium thiocyanate in a reaction mixture if 0.10 mol of NaSCN is dissolved in 1.0 L of solution?

Step 1: Understand the concept of molarity (M), which is defined as the number of moles of solute divided by the volume of solution in liters. The formula for molarity is: $M=\frac{n}{V}$, where $n$ is the number of moles of solute and $V$ is the volume of solution in liters.