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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

Hydrogen is used in the Haber-Bosch process, and this is made from natural gas in a process called steam reforming.

CH4(g) + H2O(g)→CO(g) + 3 H2(g)

CO(g) + H2O(g) → CO2(g) + H2(g)

  1. a. Are the two reactions above endo- or exothermic?
  2. b. To obtain the H2 necessary to manufacture 15 billion kilograms of NH3 what mass of CH4 is required, and what mass of CO2 is produced as a by-product (assuming complete conversion of the CH4)?

(a)

Interpretation Introduction

Interpretation: The given reaction has to be identified for endothermic or exothermic.

Concept Introduction: Enthalpy change for the reaction ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

Exothermic when ΔH is negative and endothermic when ΔH is positive.

Explanation
  • CH4+H2OCO+3H2

ΔrH0=(1molCO/molrxn)[ΔfH0CO](1molCH4/molrxn)[ΔfH0(CH4)](2molH2O/molrxn)[ΔfH0(H2O)]

ΔrH0=(1molCO/molrxn)[110.5](1molCH4/molrxn)[74.87kJ/mol](2molH2O/molrxn)[241.8kJ/mol]=206

(b)

Interpretation Introduction

Interpretation: The mass of CO2 that is produced as a by-product has to be identified.

Concept Introduction: Enthalpy change for the reaction ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

Exothermic when ΔH is negative and endothermic when ΔH is positive.

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