Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 4 - Energy and Chemical Reactions - Questions for Review and Thought - Topical Questions - Page 189e: 76a


$2Al(s) + \frac{3}{2}O_2(g) -- \gt Al_2O_3(s)$ ; $\Delta_fH^{\circ}\{Al_2O_3\}$ = $-1675.7 kJ/mol$

Work Step by Step

1. Write the separated atoms, and their coefficients, to form a single $Al_2O_3$: $2Al + 3O -- \gt Al_2O_3(s)$ 2. Analyze the appendix J, and find the standard state for the elements. - Divide the coefficient by the number of atoms in each compound in standard state: $\frac{2}{1} Al(s) + \frac{3}{2}O_2(g) -- \gt Al_2O_3(s)$ $2Al(s) + \frac{3}{2}O_2(g) -- \gt Al_2O_3(s)$ $\Delta_fH^{\circ}\{Al_2O_3\}$ = $-1675.7 kJ/mol$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.