In chemistry, the term ‘molarity’ (M) is used to describe the concentration of a solution. A 1 M (1 molar) solution means that there is 1 mole of solute dissolved in 1 liter of solution.
So, if you have 1 liter of a 1 M solution, it contains exactly 1 mole of the solute. This is because molarity is defined as the number of moles of solute per liter of solution.
For example, if you have a 1 M solution of sodium chloride (NaCl), there is 1 mole of NaCl in every liter of that solution. This relationship is crucial for various chemical calculations, including dilutions and reactions.