Chapter 8, Problem 37A

(a)

Interpretation Introduction

Interpretation: The given combustion reaction needs to be balanced.

  ${\text{C}}_2{\text{H}}_6{}_{\text{(g)}}{\text{ + O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{ CO}}_{\text{2}}{}_{\text{(g)}}+{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

Concept Introduction:A chemical reaction can be described as the process of conversion of reactant molecules to product molecules by breaking and making of chemical bonds.

A balance chemical reaction contains same number of atoms at both sides of the chemical reaction.

Answer to Problem 37A

  ${\text{2 C}}_2{\text{H}}_6{}_{\text{(g)}}{\text{ + 7 O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{ 4 CO}}_{\text{2}}{}_{\text{(g)}}+6{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

Explanation of Solution

In a balance chemical equation, the number of atoms must be same at both sides. To balance a chemical reaction, coefficients must be added with the chemical formula to make it same at both sides.

Reactant	Product
C = 2→4	C = 1→4
H = 6→12	H = 2→12
O = 2→14	O = 3→10

Thus the balance chemical equation must be:

  ${\text{2 C}}_2{\text{H}}_6{}_{\text{(g)}}{\text{ + 7 O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{ 4 CO}}_{\text{2}}{}_{\text{(g)}}+6{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

(b)

Interpretation Introduction

Interpretation: The given combustion reaction needs to be balanced.

  ${\text{C}}_{\text{2}}{\text{H}}_{\text{6}}{\text{O}}_{\text{(l)}}{\text{ + O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{ CO}}_{\text{2}}{}_{\text{(g)}}+{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

Concept Introduction:A chemical reaction can be described as the process of conversion of reactant molecules to product molecules by breaking and making of chemical bonds.

A balance chemical reaction contains same number of atoms at both sides of the chemical reaction.

Answer to Problem 37A

  ${\text{C}}_{\text{2}}{\text{H}}_6{\text{O}}_{\text{(l)}}{\text{ + 3 O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{ 2 CO}}_{\text{2}}{}_{\text{(g)}}+3{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

Explanation of Solution

In a balance chemical equation, the number of atoms must be same at both sides. To balance a chemical reaction, coefficients must be added with the chemical formula to make it same at both sides.

Reactant	Product
C = 2	C = 1→2
H = 6	H = 2→6
O = 3→7	O = 3→7

Thus the balance chemical equation must be:

  ${\text{C}}_{\text{2}}{\text{H}}_6{\text{O}}_{\text{(l)}}{\text{ + 3 O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{ 2 CO}}_{\text{2}}{}_{\text{(g)}}+3{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

(c)

Interpretation Introduction

Interpretation: The given combustion reaction needs to be balanced.

  ${\text{C}}_2{\text{H}}_6{\text{O}}_{\text{2}}{}_{\text{(l)}}{\text{ + O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{ CO}}_{\text{2}}{}_{\text{(g)}}+{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

Concept Introduction:A chemical reaction can be described as the process of conversion of reactant molecules to product molecules by breaking and making of chemical bonds.

A balance chemical reaction contains same number of atoms at both sides of the chemical reaction.

Answer to Problem 37A

  ${\text{2 C}}_2{\text{H}}_6{\text{O}}_{\text{2}}{}_{\text{(l)}}{\text{ +5 O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{4 CO}}_{\text{2}}{}_{\text{(g)}}+6{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$

Explanation of Solution

In a balance chemical equation, the number of atoms must be same at both sides. To balance a chemical reaction, coefficients must be added with the chemical formula to make it same at both sides.

Reactant	Product
C = 2→4	C = 1→4
H = 6→12	H = 2→12
O = 4→14	O = 3→14

Thus the balance chemical equation must be:

  ${\text{2 C}}_2{\text{H}}_6{\text{O}}_{\text{2}}{}_{\text{(l)}}{\text{ +5 O}}_{\text{2}}{}_{\text{(s) }}\stackrel{}{\to }{\text{4 CO}}_{\text{2}}{}_{\text{(g)}}+6{\text{H}}_{\text{2}}{\text{O}}_{\text{(g)}}$