Combustion Reaction - Writing and Balancing


and

Moderators: Chem_Mod, Chem_Admin

Michael_Johanis_2K
Posts: 26
Joined: Thu Jul 28, 2016 3:00 am
Been upvoted: 1 time

Combustion Reaction - Writing and Balancing

Postby Michael_Johanis_2K » Sun Jan 22, 2017 12:52 am

For 8.93, we have to write the combustion reaction for C6H6 (l).

The solutions manual says:
C6H6 (l) + 7.5 O2 (l) ----> 6CO2 (g) + 3H2O (l)


1) Why is 3H2O a liquid? Shouldn't all the products in combustion reactions be gases?
2) Why is 7.5 the coefficient for O2? Shouldn't everything be in whole numbers? I think we should double everything to make all the coefficients whole numbers.

Theresa Dinh 3F
Posts: 26
Joined: Fri Jul 22, 2016 3:00 am

Re: Combustion Reaction - Writing and Balancing

Postby Theresa Dinh 3F » Tue Jan 24, 2017 12:50 pm

H2O is normally a liquid. Especially since the combustion reaction appears to be just two liquids reacting with each other, which means that most likely they are not heating up enough to react. O2 liquid is usually found in only extremely cold temperatures.

You can double the equation if needed, but that would mean you need to double the delta h of the reaction as well. This gives the equation in simplified form.

danae_blodgett_1H
Posts: 18
Joined: Sat Jul 23, 2016 3:00 am

Re: Combustion Reaction - Writing and Balancing

Postby danae_blodgett_1H » Sun Jan 29, 2017 12:20 pm

Can other products be liquid as well, or only H2O?


Return to “Calculating Work of Expansion”

Who is online

Users browsing this forum: No registered users and 1 guest