Chapter 3, Problem 64E

(a)

Interpretation Introduction

Interpretation: Balanced form of the stated chemical equation.

Concept introduction:
According to the law of conservation of mass, mass can neither be created nor destroyed. The mass of reactants is equal to the mass of products formed. Therefore a chemical equation, having lesser number of moles of an element on either side of a reaction, is balanced using appropriate numerical coefficients to satisfy the law of conservation of mass.

(b)

Interpretation Introduction

Interpretation: The mass of $\text{CO}$ that can react with $\text{0}\text{.350}\text{kg}\left(350\text{g}\right)$ of ${\text{Fe}}_2{\text{O}}_{\text{3}}$ .

Concept introduction:
The balanced chemical equation is:

  ${\text{Fe}}_2{\text{O}}_3\left(s\right)+3\text{CO}\left(g\right)\to 2\text{Fe}\left(s\right)+3{\text{CO}}_2\left(g\right)$

Here, one mole of ferric oxide reacts with three moles of carbon monoxide to form 2 moles of iron and three moles of carbon dioxide.

(c)

Interpretation Introduction

Interpretation: The mass of $\text{Fe}$ and ${\text{CO}}_2$ formed when $350\text{g}$ of ${\text{Fe}}_2{\text{O}}_{\text{3}}$ reacts with $\text{CO}$

Concept introduction:
The balanced chemical equation is:

  ${\text{Fe}}_2{\text{O}}_3\left(s\right)+3\text{CO}\left(g\right)\to 2\text{Fe}\left(s\right)+3{\text{CO}}_2\left(g\right)$

Here, one mole of ferric oxide reacts with three moles of carbon monoxide to form 2 moles of iron and three moles of carbon dioxide.

(d)

Interpretation Introduction

Interpretation: The justification corresponding to the consistency of the solutions in part (b) and part (c) with the law of conservation of mass.

Concept introduction:
According to the law of conservation of mass,

  $\begin{array}{c}\text{Mass}\text{of}\text{reactants}=\text{Mass}\text{of}\text{products}\\ \text{Mass}\text{of}{\text{Fe}}_2{\text{O}}_3+\text{Mass}\text{of}\text{CO}=\text{Mass}\text{of}\text{Fe}+\text{Mass}\text{of}{\text{CO}}_2\end{array}$