Chapter 11.2, Problem 22SSC

Interpretation Introduction

Interpretation:

The concept map for the given reaction needs to be explained to determine the mass of ${\text{CaCl}}_{\text{2}}$ formed from given mass of $\text{HCl}$.

Concept introduction:

The ratio of mass of substance to its molar mass is said to be number of moles of that substance.

The ratio of amount of any two compounds involved in a chemical reaction in terms of mole is said to be mole ratio, and used as a conversion factor between reactants and products.

Answer to Problem 22SSC

The concept map to determine the mass of ${\text{CaCl}}_{\text{2}}$ formed from given mass of $\text{HCl}$ is:

Explanation of Solution

Given:

The balanced reaction:

${\text{CaCO}}_{\text{3}}\text{(s) + 2HCl(aq) }\to {\text{ CaCl}}_{\text{2}}{\text{(aq) + H}}_{\text{2}}{\text{O(l) + CO}}_{\text{2}}(\text{g})$

In order to determine the mass of ${\text{CaCl}}_{\text{2}}$ produced from given mass of $\text{HCl}$, the following steps are followed:

• The coefficients from the balanced reaction is used to calculate the mole ratio of ${\text{CaCl}}_{\text{2}}$ and $\text{HCl}$, that is the mole ratio from the balanced reaction for $\text{HCl}$ : ${\text{CaCl}}_{\text{2}}$ is $2:1$ .
• The given mass of $\text{HCl}$ is divided by the molar mass of $\text{HCl}$ to calculate the number of moles of $\text{HCl}$ .
• The calculated number of moles of $\text{HCl}$ are used to calculate the number of moles of ${\text{CaCl}}_{\text{2}}$ using the mole ratio determined from the balanced equation.
• Now, the obtained number of moles of ${\text{CaCl}}_{\text{2}}$ are multiplied by the molar mass of ${\text{CaCl}}_{\text{2}}$ to convert moles of ${\text{CaCl}}_{\text{2}}$ to grams, the mass of ${\text{CaCl}}_{\text{2}}$ .

Hence, the concept map to determine the mass of ${\text{CaCl}}_{\text{2}}$ formed from given mass of $\text{HCl}$ is: