Question

Part E

Write a balanced chemical equation depicting the formation of one mole of POCl3(l) from its elements in their standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

14P4(s)+12O2(g)+112Cl3(g)→POCl3(l)

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Part F

For POCl3(l), find the value of ΔH∘f. (Use Appendix C in the textbook).

Express your answer using four significant figures.

ΔH∘f =		kJ

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Part G

Write a balanced chemical equation depicting the formation of one mole of C2H5OH(l) from its elements in their standard states.

Express your answer as a chemical equation. Identify all of the phases in your answer.

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Part H

For C2H5OH(l), find the value of ΔH∘f. (Use Appendix C in the textbook).

Express your answer using four significant figures.

ΔH∘f =		kJ

Answer 1

Part E :

The constituent elements for the formation of POCl₃(l) are P , O & Cl and their standard states are P₄(s) , O₂(g) & Cl₂(g) respectively.

The balanced chemical equation for the formation of one mole of POCl3(l) from its elements in their standard states is

(1/4) P₄(s) + (1/2) O₂(g) + (3/2) Cl₂(g) ----> POCl₃(l)

Part F:

ΔH = ΔH⁰_fproducts – ΔH⁰_freactants

ΔH = [ΔH⁰_{fPOCl3 (l)} )]- [( (1/4) ΔH⁰_fP4(s) )+ ((1/2) ΔH⁰_{fO2 (g)} )+(3/2) ΔH⁰_{fCl2 (g)} )]

     = -559.82 - [(1/4)*0 + (1/2)*0 + (3/2)*0 ] kJ

     = -559.82 kJ

Part G :

The constituent elements for the formation of C₂H₅OH(l) are C , H & O and their standard states are C(graphite) , H₂(g) & _O2(g) respectively.

The balanced chemical equation for the formation of one mole of C₂H₅OH(l) from its elements in their standard states is

2C(graphite) + 3H₂(g) + (1/2)O₂(g) ---> C₂H₅OH(l)

ΔH = ΔH⁰_fproducts – ΔH⁰_freactants

ΔH = [ΔH⁰_{fPOCl3 (l)} )]- [( (1/4) ΔH⁰_fP4(s) )+ ((1/2) ΔH⁰_{fO2 (g)} )+(3/2) ΔH⁰_{fCl2 (g)} )]

      = [-277.7] - [ (1/4*0 + (1/2)*0 + (3/2)*0 ] kJ

      = -277.7 kJ