Question

Determine the value for the following reaction. 2HI(g) + 2.4 kcal → H2(g) + l2(g) ΔH =

Answer 1

Answer: $\Delta H=+2.4 kcal$

Explanation:

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.

The heat is shown on the reactant side.

$2HI(g)+2.4kcal\rightarrow H_2(g)+I_2(g)$

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.

The heat is shown on the product side.

Answer 2

In a chemical reaction, the reactants are placed on the left hand side of the reaction equation while the products are placed on the right hand side.
The 2.4 kcal of energy shown in the reactants side represents the energy that must be added to the reaction mixture for this reaction to proceed. Therefore, the value of ΔH is 2.4 kcal.