Question

Consider the following energy diagram.

Activation complex
Actual
Reaction
Enthalpy or Bonding Energy
Increase
=
2.4
kcal
mole Ha
-
-
2H
Progress of Reaction
What type of reaction does this diagram illustrate?
endothermic
exothermic

Answer 1

Answer: endothermic

Step-by-step explanation:

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and
`\Delta H` for the reaction comes out to be negative.

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and
`\Delta H` for the reaction comes out to be positive.

Given :
`\Delta H=2.4kcal/mol`

As heat change is positive, the reaction is endothermic. Energy of products is more as compared to energy of reactants and thus energy is absorbed.

Answer 2

Endothermic

Step-by-step explanation:

The reaction has a positive H of 2.4 kcal /mole H2, meaning the reaction is absorbing entalphy and the products have more entalphy than the reactants