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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Write a balanced chemical equation for the formation of CaCO3(s) from the elements in their standard states. Find the value for Δr for CaCO3(s) in Appendix L.

Interpretation Introduction

Interpretation:

The enthalpy change for the formation of CaCO3 has to be determined.

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

Explanation

The balanced equation is CaO+CO2CaCO3 in the reaction, on the left one carbon atom and one calcium and three oxygens and on the right hand side one carbon atom and one calcium and three oxygens, so the given equation is balanced.

The change in enthalpy is:

  ΔfH0=(1molCaO1mol-rxn)ΔfH0(CaO)+(1molCO21mol-rxn)ΔfH0(CO2)-(1molCaCO31mol-rxn)ΔfH

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