Question

What is the overall enthalpy change DHrxn for the system?

Answer 1

Your answer is 300 kJ

hope this helps! (:

Answer 2

Answer: The overall enthalpy for the system is -1300 kJ.

Explanation:

Enthalpy change of the reaction is defined as the difference in the potential energy of the products and the potential energy of the reactants. This is represented as $\Delta H_{rxn}$

The equation used to represent enthalpy change of the reaction follows:

$\Delta H_{rxn}=\Delta H_{products}-\Delta H_{reactants}$

where,

$\Delta H_{products}$ = potential energy of the products = [(-200) + (-300)]kJ = -500kJ

$\Delta H_{reactant}$ = potential energy of the reactants = 800kJ

Putting values in above equation:

$\Delta H_{rxn}=[-500-(800)]kJ=-1300kJ$

Hence, the overall enthalpy for the system is -1300 kJ.