Question

How can you solve mass to mass stoichiometry problems?

Answer 1

The mass –mass stoichiometry calculation involves the converting the given mass of the reactant into moles of the reactants and then by using mole ratio the mole of the product is determined which is then converted to mass.

Complete step by step answer:
The stoichiometry is derived from a Greek word “stoichen” which means element and “metron” means measure. So, stoichiometry deals with determining the amount of reactants and products which are consumed and produced within a given chemical reaction.
The stoichiometry is based on the principles of law of conservation of mass. The Law of conservation of mass states that the matter can neither be created nor be destroyed. Therefore, the mass of each element present in the products side of the chemical reaction should be equal to the mass of each present in the reactants side.
To solve the mass stoichiometry problem, first we need to balance the chemical equation. With the help of a balanced chemical equation, the mole ratio can be determined.
Now from the given mass of the reactant first we need to determine the moles of the reactants by using the molecular weight of the compound. In the formula used to calculate the number of moles of the reactant the given mass is divided by the molecular weight. Once the moles is determined, the moles of the product is calculated using the mole ratio. After getting the moles of the product, the mass of the product is calculated by multiplying the moles with the molecular weight.

Note:
The stoichiometry method is also helpful in determining the limiting reactant or the reagent and the excess reactant which is present in the chemical reaction even after the completion.