when producing hydrogen iodide, the energy of reactants is 581 kJ/mol, and the energy of the products is 590kJ/mol. the equation is shown.
h2 + l2 > 2HI
what is the total energy of the reaction? is this endothermic or exothermic reaction?
a ) -9 kJ/mol, exothermic
b ) 9 kJ/mol, exothermic
c ) -9 kJ/mol, endothermic
d ) 9 kJ/mol, endothermic
The total energy change of the reaction, also known as the enthalpy change (ΔH), is calculated by subtracting the energy of the reactants from the energy of the products.
Energy of products = 590 kJ/mol
Energy of reactants = 581 kJ/mol
ΔH = Energy of products - Energy of reactants
ΔH = 590 kJ/mol - 581 kJ/mol
ΔH = +9 kJ/mol
Because the energy of the products is higher than the energy of the reactants, this reaction requires an input of energy and thus, the reaction is endothermic.
Therefore, the correct answer is:
d) 9 kJ/mol, endothermic