The complete combustion of carbon compounds produces carbon dioxide.The reaction of coal with water at high temperatures produces synthesis gas,which is a mixture of carbon monoxide and hydrogen.Use the bond energies in the table below to estimate how much more energy is released by reaction I than by reaction II,that is,estimate $\Delta$H_I - $\Delta$H_II. (I)C(g)+ O₂(g)$\to$ CO₂(g) (II)C(g)+ H₂O(g)$\to$ CO(g)+ H₂(g) * C O bond in CO₂

Question

Quizplus · Accepted Answer

We need to find the energy difference between the two reactions, which is given by:

ΔH = (bonds broken in reactants) - (bonds formed in products)

For reaction I:

Bonds broken:
- 1 C=O bond (799 kJ/mol)
- 1 O-O bond (498 kJ/mol)
Total energy needed to break bonds in reactants = 1297 kJ/mol

Bonds formed:
- 1 C-O bond (1072 kJ/mol)
Total energy released by bond formation in products = 1072 kJ/mol

ΔH for reaction I = (1297 kJ/mol) - (1072 kJ/mol) = 225 kJ/mol

For reaction II:

Bonds broken:
- 1 C-H bond (436 kJ/mol)
- 1 O=H bond (463 kJ/mol)
Total energy needed to break bonds in reactants = 899 kJ/mol

Bonds formed:
- 1 C=O bond (799 kJ/mol)
- 1 O-H bond (463 kJ/mol)
Total energy released by bond formation in products = 1262 kJ/mol

ΔH for reaction II = (899 kJ/mol) - (1262 kJ/mol) = -363 kJ/mol

Note that the ΔH value for reaction II is negative because it represents an endothermic reaction (more energy is needed to break bonds in reactants than is released by the formation of new bonds in products).

Finally, we can calculate the energy difference between the two reactions:

ΔH(diff) = ΔH(I) - ΔH(II) = 225 kJ/mol - (-363 kJ/mol) = 588 kJ/mol

Therefore, the estimated energy released by reaction I is about 588 kJ/mol more than the energy released by reaction II. However, none of the given answer choices match this exact value. The closest one is A) 518 kJ/mol, which is within a reasonable range of the calculated value.

The Complete Combustion of Carbon Compounds Produces Carbon Dioxide Δ\DeltaΔ HI -

The Complete Combustion of Carbon Compounds Produces Carbon Dioxide $\Delta$ H_I -