From the data below, calculate the approximate enthalpy change for the reaction below.

A) -806 kJ
B) -98 kJ
C) 98 kJ
D) 120 kJ
E) 806 kJ

Question

From the data below, calculate the approximate enthalpy change for the reaction below.

A) -806 kJ 
B) -98 kJ 
C) 98 kJ 
D) 120 kJ 
E) 806 kJ

Quizplus · Accepted Answer

Based on the given data, the enthalpy of the reactants is 1256 kJ/mol (sum of individual enthalpies) and the enthalpy of the products is 450 kJ/mol (sum of individual enthalpies). The enthalpy change (ΔH) can be calculated as the difference between the enthalpies of the products and the reactants (ΔH = products - reactants), which comes out to be -806 kJ/mol. The negative sign indicates that the reaction is exothermic, i.e. it releases energy in the form of heat. Therefore, option A (-806 kJ) is the correct choice.

From the Data Below, Calculate the Approximate Enthalpy Change for the Reaction