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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

  1. (a) Calculate the enthalpy change, ΔrH°, for the formation of 1.00 mol of strontium carbonate (the material that gives the red color in fire­works) from its elements.

Sr(s) + C(s) + 3 2 , O2(g) → SrCO3(s)

The experimental information available is

Sr(s) +½ O2(g) → SrO(s)

       ΔfH° = –592 kJ/mol-rxn

SrO(s) + CO2(g) → SrCO3(s)

       ΔrH° = –234 kJ/mol-rxn

C(graphite) + O2(g) → CO2(g)

       ΔfH° = –394 kJ/mol-rxn

  1. (b) Draw an energy level diagram relating the energy quantities in this problem.

(a)

Interpretation Introduction

Interpretation:

The enthalpy change of formation of 1mol of SrCO3 has to be determined

Concept Introduction:

The standard enthalpy change of combustion of a compound is the enthalpy change which occurs when one gram of the compound is burned completely in oxygen under standard conditions, and with everything in its standard state.

  ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

Explanation

Adding all the equations given, the required equation is observed. Therefore adding 3ΔfH0 of the corresponding equation we get,

Given formation constant are:

  1.ΔrH0=-592kJ/mol2.ΔrH0=-234kJ/mol3

(b)

Interpretation Introduction

Interpretation:

The energy level diagram for the change of formation of 1mol of SrCO3 has to be depicted.

Concept Introduction:

The standard enthalpy change of combustion of a compound is the enthalpy change which occurs when one gram of the compound is burned completely in oxygen under standard conditions, and with everything in its standard state.

  ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

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