Question

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. H2 + I2 → 2HI What is the total energy of the reaction? Is this an endothermic or exothermic reaction? (1 point) Responses 9 kJ/mol, exothermic 9 kJ/mol, exothermic –9 kJ/mol, endothermic –9 kJ/mol, endothermic –9 kJ/mol, exothermic –9 kJ/mol, exothermic 9 kJ/mol, endothermic

Answer 1

To determine the total energy of the reaction and whether it is endothermic or exothermic, we can use the given energies of the reactants and products.

The energy of the reactants (H2 + I2) is 581 kJ/mol, and the energy of the products (2HI) is 590 kJ/mol.

To find the change in energy (ΔE) of the reaction, we can use the formula:

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

Substituting the values:

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

Since the change in energy is positive (9 kJ/mol), the reaction absorbs energy from the surroundings, indicating that it is endothermic.

Therefore, the correct response is:

9 kJ/mol, endothermic.