Determine the energy change in kJ/mol for the following two reactions:

Question

Determine the energy change in kJ/mol for the following two reactions:
K(g)+H(g)→K+(g)+H−(g)
K(g)+H(g)→K−(g)+H+(g)
Enter your answers separated by a comma.

Answer 1

If the question asks you to give quantitative answers you need to give me more information so I can help you. I'm guessing that you have to use standard enthalpies of formation. A standard enthalpy of formation gives the energy for the formation of elements in their standard states. You would need to refer to your textbook which should have a table of standard enthalpies of formation. To calculate the energy difference or enthalpy you use the following equation.

 

delta H = sum(n_pdeltaH_f_p) - sum(n_rdeltaH_f_r)

 

where n_p and n_r refer to the number of moles of products and reactants and deltaH_f is the enthalpy of formation.