Chapter 6, Problem 6.144MP

(a)

Interpretation Introduction

Interpretation:

The percentage $\text{Cl}$ in the alkaline-earth chloride has to be calculated.

Concept introduction:

Number of moles:

One mole is the equal to number of atoms in $\text{12g}$ of carbon $\text{-12}$ which is equal to $\text{6}{\text{.023×10}}^{\text{23}}$ atoms. This is also known as Avogadro number.

Number of moles = $\frac{\text{given}\text{mass of the compound}}{\text{molar}\text{mass}\text{of}\text{compound}}$

Percentage of compound = $\frac{\text{mass}\text{of}\text{element}}{\text{molar}\text{mass}\text{of}\text{compound}}\text{×100}$

(b)

Interpretation Introduction

Interpretation:

The identity of the alkaline-earth metal has to be identified.

Concept introduction:

Number of moles:

One mole is the equal to number of atoms in $\text{12g}$ of carbon $\text{-12}$ which is equal to $\text{6}{\text{.023×10}}^{\text{23}}$ atoms. This is also known as Avogadro number.

Number of moles = $\frac{\text{given}\text{mass of the compound}}{\text{molar}\text{mass}\text{of}\text{compound}}$

Percentage of compound = $\frac{\text{mass}\text{of}\text{element}}{\text{molar}\text{mass}\text{of}\text{compound}}\text{×100}$

(c)

Interpretation Introduction

Interpretation:

The balanced equation of the chemical reactions has to be written.

Concept introduction:

Balanced reaction is a chemical reaction in which number of atoms for each element in the reaction and the total charge are same on both reactant side and the product side.

Steps in balancing the information

• Step 1: Write the unbalanced equation
• Step 2: Find the coefficient to balance the equation.
• The coefficient should be reduced to the smallest whole number

(d)

Interpretation Introduction

Interpretation:

The reaction of the alkaline-earth metal with chlorine and reactant in excess and number of grams of that reactant remain unreacted has to be calculated.

Concept introduction:

Number of moles:

One mole is the equal to number of atoms in $\text{12g}$ of carbon $\text{-12}$ which is equal to $\text{6}{\text{.023×10}}^{\text{23}}$ atoms. This is also known as Avogadro number.

Number of moles = $\frac{\text{given}\text{mass of the compound}}{\text{molar}\text{mass}\text{of}\text{compound}}$

Molar mass = $\frac{\text{mass}\text{of}\text{compound}}{\text{amount}\text{of}\text{substance}}$

Limiting reagent:

In a chemical reaction, the substance which is totally consumed at the end of the reaction is known as limiting reaction. Without the particular atom or element the reaction cannot be procced further or the product becomes limited.