Final answer:
Molarity is a way to express concentration in terms of the number of moles of solute per liter of solution. It allows chemists to accurately measure the amount of a compound in a given volume of solution.
Step-by-step explanation:
Molarity is a way to express concentration in terms of the number of moles of solute per liter of solution. It is represented by the symbol 'M' and is often abbreviated as 'mol/L'. Molarity allows chemists to accurately measure the amount of a compound in a given volume of solution, which is important for chemical reactions of known stoichiometry.
For example, if 119.0 grams of potassium bromide (KBr) is dissolved in 1.000 L of water, the resulting solution would have a concentration of 1.000 mole/L, or 1.000 M. If half of this solution (0.500 L) is taken, it would contain 0.500 moles of KBr.