When producing hydrogen iodide, the energy of the reactants is 581 kJ/mol, and the energy of the products is 590 kJ/mol. The equation is shown.

Question

H2 + I2 → 2HI

What is the total energy of the reaction? Is this an endothermic or exothermic reaction?

(1 point)
Responses

9 kJ/mol, endothermic
9 kJ/mol, endothermic

9 kJ/mol, exothermic
9 kJ/mol, exothermic

–9 kJ/mol, endothermic
–9 kJ/mol, endothermic

–9 kJ/mol, exothermic
–9 kJ/mol, exothermic

Answer 1

To determine the total energy of the reaction, we can calculate the difference between the energy of the products and the energy of the reactants.

Given:

• Energy of reactants (H2 + I2) = 581 kJ/mol
• Energy of products (2HI) = 590 kJ/mol

Now, we can calculate the change in energy (ΔE) for the reaction:

\[ \Delta E = \text{Energy of products} - \text{Energy of reactants} \]

\[ \Delta E = 590 \text{ kJ/mol} - 581 \text{ kJ/mol} = 9 \text{ kJ/mol} \]

Since the result (9 kJ/mol) is positive, this indicates that energy is absorbed during the reaction as it occurs. Thus, this reaction is endothermic.

So, the correct response is: 9 kJ/mol, endothermic.