Question
Question: Chlorine is prepared in the laboratory by treating manganese dioxide (\(Mn{O_2}\)) with aqueous hydr...
Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid according to the reaction,
MnO2+4HCl→MnCl2+Cl2+2H2O
How many grams via will react with 5g MnO2?
Solution
Balanced chemical reaction: The reaction in which the number of atoms on both the sides i.e. on the reactant side and on the product side are same, are known as balanced chemical reaction. By balanced chemical reaction we get the relation between the number of moles of reactants with the number of moles of products.
Complete step by step answer:
First of all we will talk about reagents and products.
Reagents: those compounds which react with each other to form the other compounds, are known as reagents. They are present on the left side of the reaction.
Products: The compounds formed by the reaction of reagents, are known as products. They are present on the right side of the reaction.
Now we will see what is a balanced reaction?
Balanced reaction: The reaction in which the number of all atoms on both sides i.e. on the reactant side and on the product side are same, are known as balanced reactions. By the balanced chemical reaction we get to know the relation between the number of moles of reactants with the number of moles of product.
In the given question the reaction is as:
MnO2+4HCl→MnCl2+Cl2+2H2O
By the reaction it is clear that one mole of manganese oxide reacts with four moles of hydrochloric acid to form one mole of manganese chloride with one mole of chlorine and two moles of water molecules. In other words we can say that one mole of manganese oxides means 87g mass of manganese oxide reacted with four moles of hydrochloric acid means 146g mass of hydrochloric acid. So we can say that 87g of manganese oxide will react with 146g of hydrochloric acid.
In the question we are given with 5g of MnO2. Since 87g of manganese oxide will react with 146g of hydrochloric acid then 5g of MnO2 will react with 87146×5=8.39g of HCl.
So we can say that 146g of hydrochloric acid requires 8.39g of HCl for complete reaction.
Note:
Number of moles is defined as the ratio of mass of substance to the molar mass of the substance. In the balanced chemical reaction we can get the information about how much moles will react with how much moles of other reactants to form the product of given quantity.