Chemistry stuff

Question

1. Using the bond energies table from the back cover of the book, determine the ∆H of the

following reaction (it may help to draw Lewis dot structures):

2H2(g) + O2 (g) → 2H2O

Answer 1

Find total bond energies of the reactants

Find total bond energies of the products

Add them to get the answer.

For reactants, you have to break bonds which requires energy so ∆H will be positive

For products, energy is releases so ∆H will be negative