Question

The value of the enthalpy change ( ΔH) for the reaction below is -126 kJ. How much energy (in kJ) is released when 2 mol of NaI is formed in the reaction?

2 Na+I_2 →2NaI

a) 126 kJ
b) 252 kJ
c) -252 kJ
d) -504 kJ

Answer 1

The energy released when 2 moles of NaI are formed in the given reaction is -252 kJ.

Step-by-step explanation:

The question is asking how much energy is released when 2 moles of NaI are formed in a reaction that has an enthalpy change (ΔH) of -126 kJ. Given that the ΔH value is for the formation of 2 moles of NaI, if 2 moles of NaI are formed, the energy released is exactly the value of ΔH for the reaction. Therefore, the amount of energy released in the formation of 2 moles of NaI is -252 kJ.