Question

What is the the heat of reaction, delta, in kJ/mol?

a) -26kJ/mol
b) -25kJ/mol
c) -10kJ/mol
d)-35kJ/mol​

Answer 1

b) -25 kJ/mol.

Step-by-step explanation:

Hello there!

In this case, since the general definition of the enthalpy of reaction involves the subtraction of the energy of the products and the energy of the reactants:

`\Delta H=H_(prod)-H_(react)`

Thus, since the graph shows that the energy of the products is 20 kJ/mol and that of reactants 45 kJ/mol, we will obtain:

`\Delta H=20kJ/mol-45kJ/mol\\\\\Delta H=-25kJ/mol`

Which means it is exothermic.

Regards!