First, balance the equation so there is an equal number of atoms on either side. Next, calculate the molecular weight and product by adding up the masses. Divide the mass of the reactant and the product by their molecular weight to find the number of moles. To determine the limiting reagent, multiply the mass of a solid reactant by its molecular weight. Then, multiply the result by the number of moles in the reactant. The product is known as the limiting agent. To find the calculation of the theoretical yield, multiply the ratio of the limiting agent and the synthesized product and multiply that by the number of moles in the limiting reagent. Finally, multiply the result by the molecular weight of the product.