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)

Question

Mohammad

Chemistry

3 April, 07:21

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)

+1

Answers (2)

Know the Answer?

Anna Fritz · Answer 1

Anna Fritz 3 April, 07:39

0

O2 has a value close to 0KJ

Meadow Freeman · Answer 2

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.

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)

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)