Question

CH10: Q07 Homework Important Answered What is the AHrxn for the reaction H2 + 12 + 2 HI ? And is the reaction exothermic or enothermic? O A 69 kcal/mol, endothermic 242 kcal/mol, enothermic -2 kcal/mol, exothermic O D 69 kcal/mol, exothermic E -2 kcal/mol, endothermic F 242 kcal/mol, exothermic Answered Change your responses to resubmit
What is the ΔH$_r$$_x$$_n$ for the reaction H$_2$ + I$_2$ ➞ 2 HI ? And is the reaction exothermic or endothermic?

Answer 1

CH10: Q07 Homework Important Answered What is the AHrxn for the reaction H2 + 12 + 2 HI ? And is the reaction exothermic or enothermic? O A 69 kcal/mol, endothermic B 242 kcal/mol, enothermic C -2 kcal/mol, exothermic 69 kcal/mol, exothermic E -2 kcal/mol, endothermic F 242 kcal/mol, exothermic Answered Change your responses to resubmit

Explanation :

H2   + I2    ----------->   2 HI

delta Hrxn = deltaHfproducts - deltaHf reactants

                  =2 x 26.5 - 62.4

                  = - 9.4 kJ/mol

delta Hrxn = - 2 kcal /mol