Chapter 10, Problem 13CI

(a)

Interpretation Introduction

Interpretation : The number of copper atoms needs to be calculated.

Concept Introduction : According to Avogadro’s law, in 1 mol of a substance there are $6.023\times {10}^{23}$ atoms. Thus, from number of moles and Avogadro’s number, the number of atoms of an element can be calculated as follows:

  $N=n\times N_A$

Here, N is number of atoms and n is number of moles.

The mass of an element is related to number of moles as follows:

  $n=\frac{m}{M}$

Here, m is mass and M is molar mass.

(b)

Interpretation Introduction

Interpretation : The balanced chemical reaction needs to be determined.

Concept Introduction : In a balanced chemical reaction, there are same number of constituent atoms in both sides of the reaction arrow.

(c)

Interpretation Introduction

Interpretation : The type of reaction needs to be determined.

Concept Introduction : A reaction in which two or more reactants combined to form a new compound (product) is known as combination reaction.

(d)

Interpretation Introduction

Interpretation : The mass of oxygen gas needs to be calculated.

Concept Introduction : The mass of an element is related to number of moles as follows:

  $n=\frac{m}{M}$

Here, m is mass and M is molar mass.

(e)

Interpretation Introduction

Interpretation : The mass of copper oxide formed from given mass of Cu and oxygen needs to be determined.

Concept Introduction : The mass of an element is related to number of moles as follows:

  $n=\frac{m}{M}$

Here, m is mass and M is molar mass.

(f)

Interpretation Introduction

Interpretation : The mass of CuO formed if the percent yield of the reaction is 85.0% needs to be determined.

Concept Introduction : The mass of an element is related to number of moles as follows:

  $n=\frac{m}{M}$

Here, m is mass and M is molar mass.

The percent yield of the reaction is related to actual yield and theoretical yield as follows:

  $\%\text{yield}=\frac{\text{Actual yield}}{ \text{Theoretical yield}}\times 100\%$