Chemistry
Chemistry
13th Edition
ISBN: 9781259911156
Author: Raymond Chang Dr., Jason Overby Professor
Publisher: McGraw-Hill Education
Question
Chapter 21, Problem 21.33QP

(a)

Interpretation Introduction

Interpretation:

The ΔH values for the given decomposition reaction has to be determined.

Concept introduction:

To calculate ΔH value we can use the following formula

ΔHoreaction=ΔHof(products)ΔHof(reactants)

Where, ΔH= standard enthalpy change formation

  • ΔH is inversely proportional to the decomposition of reaction.
  • When ΔH increases decomposition of reaction decreases.

(a)

Expert Solution
Check Mark

Answer to Problem 21.33QP

The ΔH values for the given decomposition is

ΔH of MgCO3 117.6 kJ/mol

Explanation of Solution

To determine ΔH values for decomposition of MgCO3(s)MgO(s)+CO2(g)

Substitute the suitable values in the following equation we get the answer as follows

ΔHoMgCO3=ΔHof(MgO)+ΔHof(CO2)ΔHof(MgCO3)

ΔHoMgCO3=(1)(-601.8 kJ/mol) + (1)(-393.5 kJ/mol) - (1)(-1112.9 kJ/mol) = 117.6 kJ/mol

Conclusion

The ΔH values for the given decomposition reaction was determined

ΔH of MgCO3 117.6 kJ/mol

(b)

Interpretation Introduction

Interpretation:

The ΔH values for the given decomposition reaction and easy decomposed by heat has to be explained.

Concept introduction:

To calculate ΔH value we can use the following formula

ΔHoreaction=ΔHof(products)ΔHof(reactants)

Where, ΔH= standard enthalpy change formation

  • ΔH is inversely proportional to the decomposition of reaction.
  • When ΔH increases decomposition of reaction decreases.

(b)

Expert Solution
Check Mark

Answer to Problem 21.33QP

The ΔH values for the given decomposition is

ΔH of CaCO3177.8 kJ/mol

  • MgCO3 easily decomposes than CaCO3.

Explanation of Solution

To determine ΔH values for decomposition of CaCO3(s)CaO(s)+CO2(g)

Substitute the suitable values in the following equation we get the answer as follows

ΔHoCaCO3=ΔHof(CaO)+ΔHof(CO2)ΔHof(CaCO3)

ΔHoCaCO3=(1)(-635.6 kJ/mol) + (1)(-393.5 kJ/mol) - (1)(-1206.9 kJ/mol) = 177.8 kJ/mol

To explain which one easily decomposes.

  • ΔH is inversely proportional to the decomposition of reaction.
  • When ΔH increases decomposition of reaction decreases.
  • So, MgCO3 easily decomposes than CaCO3.
Conclusion

The ΔH values for the given decomposition reaction and which one gets easy decomposed was explained.

ΔH of CaCO3177.8 kJ/mol

  • MgCO3 is easily decomposes than CaCO3

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Chapter 21 Solutions

Chemistry

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