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White phosphorus exists as P 4 molecules with phosphorus atoms at the corners of a tetrahedron. (a) Elemental phosphorus reacts with Cl 2 to form PCl 3 . Write a balanced chemical equation for this reaction. (b) The standard enthalpy of formation ( Δ f H ∘ ) of P 4 (g) is +58.9 kJ/mol; for PCl 3 (g) it is −287.0 kJ/mol. Use these numbers to calculate the enthalpy change for the reaction of P 4 (g) and Cl 2 (g) to give PCl 3 (g). (c) Based on the equation in (a), determine what bonds are broken and what bonds are formed. Then, use this information along with the value of Δ r H ∘ calculated in (b) and the bond dissociation enthalpies for the P—P and Cl—Cl bonds from Table 8.8 to estimate the bond dissociation enthalpy for the P—Cl bonds. How does your estimate compare with the value in Table 8.8?

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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074
BuyFind

Chemistry & Chemical Reactivity

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

Solutions

Chapter
Section
Chapter 8, Problem 95SCQ
Textbook Problem

White phosphorus exists as P4 molecules with phosphorus atoms at the corners of a tetrahedron.

Chapter 8, Problem 95SCQ, White phosphorus exists as P4 molecules with phosphorus atoms at the corners of a tetrahedron. (a)

  1. (a) Elemental phosphorus reacts with Cl2 to form PCl3. Write a balanced chemical equation for this reaction.
  2. (b) The standard enthalpy of formation ( Δ f H ) of P4(g) is +58.9 kJ/mol; for PCl3(g) it is −287.0 kJ/mol. Use these numbers to calculate the enthalpy change for the reaction of P4(g) and Cl2(g) to give PCl3(g).
  3. (c) Based on the equation in (a), determine what bonds are broken and what bonds are formed. Then, use this information along with the value of Δ r H calculated in (b) and the bond dissociation enthalpies for the P—P and Cl—Cl bonds from Table 8.8 to estimate the bond dissociation enthalpy for the P—Cl bonds. How does your estimate compare with the value in Table 8.8?

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Chapter 8 Solutions

Chemistry & Chemical Reactivity
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