Question

Is the formation of CO2(g) from its elements endothermic or exothermic?

Exothermic because the ΔH is negative.


Endothermic because the ΔH is negative.


Endothermic because the ΔH is positive.


Exothermic because the ΔH is positive.

Answer 1

Answer: Exothermic because the ΔH is negative.

Step-by-step explanation:

The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.

`C(s)+O_2(g)\rightarrow CO_2(g)`

Exothermic reactions are those reactions in which heat is released and
`\Delta H` is negative.Endothermic reactions are those reactions in which heat is absorbed and
`\Delta H` is positive.

The reaction is exothermic as the heat is released during the formation of
`CO_2` as heat of formation of
`CO_2` is negative.