What does 'Mr' stand for in the context of theoretical yield calculations?

In the context of theoretical yield calculations, 'Mr' stands for molar mass. Molar mass is the mass of one mole of a substance (in grams per mole), which is crucial for converting between the mass of reactants or products and the number of moles during stoichiometric calculations. This concept allows chemists to determine how much of a substance is needed or produced in a chemical reaction based on the balanced equation.

When calculating theoretical yield, you need to know the molar masses of the reactants and products to accurately determine the quantities involved in the reactions. By using molar mass effectively, you can calculate the maximum amount of product that can be formed from a given amount of reactants, providing a foundation for understanding reaction efficiency and limiting reactants.