Chapter 9.2, Problem 1RQ

Interpretation Introduction

Interpretation : The reason to convert mass to moles in stoichiometry problems are to be stated.

Concept Introduction : The stoichiometric number is defined as the digit that is written in front of any molecule, atom or ion that is taking part in a chemical reaction.

Answer to Problem 1RQ

In stoichiometry problems, moles provide an easy way of conversion between the numbers of molecules or atoms and calculations are expressed in terms of atoms and molecules not on mass. Therefore, it is required to convert mass to moles.

Explanation of Solution

The stoichiometric coefficient in front of reactants determines how much amount of reactant has taken part in chemical reaction. Moles provide an easy way of conversion between the number of molecules or atoms and their mass. One mole of particles is equal to $6.022\times {10}^{23}$ particles. The chemical reactions are also written in the number of atoms or molecules. Therefore, calculations in stoichiometry are expressed in terms of atoms and molecules not on mass.

Conclusion

In stoichiometry problems, moles provide an easy way of conversion between the number of molecules or atoms and calculations are expressed in terms of atoms and molecules not on mass. Therefore, it is required to convert mass to moles.