Wednesday
March 22, 2017

Post a New Question

Posted by on Thursday, May 15, 2014 at 12:03am.

Given the thermochemical equation:

2 Al(s) + 3/2 O2(g) > Al2O3(s) ΔH = -95.7 kJ

find the heat of reaction, ΔH, for the following reaction:

2 Al2O3(s)> 4 Al(s) + 3 O2(g)
Select one:
a. -95.7 kJ
b. +95.7 kJ
c. -47.8 kJ
d. +47.8 kJ
e. +191.4 kJ

  • chemistry - , Thursday, May 15, 2014 at 12:13am

    You have the reaction as shown. You want the reverse reaction and double that. So take dH that you have, change the sign (because of the reversal) and double it.

  • chemistry - , Thursday, May 15, 2014 at 12:17am

    would it be a positive or a negative though?

  • chemistry - , Thursday, May 15, 2014 at 12:19am

    it would be e...

  • chemistry - , Thursday, May 15, 2014 at 12:28am

    yes.
    You reversed the sign because the reaction is reversed. So that makes it positive. Then double that for e.

  • chemistry - , Thursday, May 15, 2014 at 12:30am

    thank you !!!

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question