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2 November, 23:36

The enthalpy change for the reaction, 2CO (g) + O2 (g) 2 CO2 (g), can be calculated from ΔHf values for each reactant and product. Which substance or substances in this equation have a ΔHf value equal to 0.0 kilojoules?

O2 (g)

CO (g)

O2 (g) and CO (g)

CO2 (g)

+3
Answers (2)
  1. 3 November, 00:29
    0
    O2 has a value close to 0KJ
  2. 3 November, 02:06
    0
    Oxygen (O₂) will have ΔHf equal to 0.0 kJ.

    Explanation:

    The enthalpy of formation of elements in their native state is considered to be zero. Oxygen in nature occurs as O₂, so its enthalpy of formation will be zero.

    the other given species are not elements, they are compounds.

    CO and CO₂ both are compounds so they cannot have enthalpy of formation equal to zero.
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