Propene (C₃H₆) gas reacts with oxygen to produce carbon dioxide and water vapor.

1) Write the balanced equation for this reaction.

2) Calculate the change in enthalpy ΔH⁰ for this reaction?

3) Is this an endothermic or exothermic reaction?

Data:

Bond energy (BE):

H-H = 436 kJ.mol^-1

C-H = 413 kJ.mol^-1

C-C = 347 kJ.mol^-1

C=C = 607 kJ.mol^-1

C-O = 358 kJ.mol^-1

C=O = 805 kJ.mol^-1

O-O = 204 kJ.mol^-1

O=O = 498 kJ.mol^-1

O-H = 464 kJ.mol^-1

Question

Propene (C₃H₆) gas reacts with oxygen to produce carbon dioxide and water vapor.

1) Write the balanced equation for this reaction.

2) Calculate the change in enthalpy ΔH⁰ for this reaction?

3) Is this an endothermic or exothermic reaction?

Data:

Bond energy (BE):

H-H = 436 kJ.mol^-1

C-H = 413 kJ.mol^-1

C-C = 347 kJ.mol^-1

C=C = 607 kJ.mol^-1

C-O = 358 kJ.mol^-1

C=O = 805 kJ.mol^-1

O-O = 204 kJ.mol^-1

O=O = 498 kJ.mol^-1

O-H = 464 kJ.mol^-1

| General Chemistry 1

Accepted Answer

1) Unbalanced: C₃H₆ (g) + O₂ (g) → CO₂ (g) + H₂O (g)

Balanced: 2 C₃H₆ (g) + 9 O₂ (g) → 6 CO₂ (g) + 6 H₂O (g)

2) ΔH⁰ = 12 BE (C-H) + 2 BE (C=C) + 2 BE (C-C) + 9 BE (O=O) -12 BE (C=O) - 12 BE (H-O)

= -3,882 kJ.mol^-1

3) ΔH⁰ < 0 ⇒ exothermic

Final - Question 5 | General Chemistry 1