## Combustion Reactions

Science questions not covered in Chem 14A and 14B. Try to limit questions to chemistry (inorganic chemistry, physical chemistry, organic chemistry, biophysical chemistry, biochemistry, materials science, environmental chemistry).

904273756
Posts: 15
Joined: Fri Sep 20, 2013 3:00 am

### Combustion Reactions

In a combustion reaction, is the water that is produced always liquid? If not, how do you determine if it is going to be liquid or gas?

Chem_Mod
Posts: 19492
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 878 times

### Re: Combustion Reactions

From the examples in the book, the water will most often be in the liquid state.

Astred 1D
Posts: 15
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Combustion Reactions

During Professor Lavell's review session number two (the camping at the sea problem) when the combustion reaction of butane was written the water was a gas. A problem similar to this in the text book, 7.105, wrote the reaction of C6H6(L) with carbon dioxide gas and water liquid as the products.

Do we use water liquid or water gas, for combustion reactions.

Neil DSilva 1L
Posts: 70
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Combustion Reactions

For those who see this post but haven't found the answer, Chem_Mod answered it here: https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=8&t=5148&sid=fdc826ba084c85c0219e9914a9020715

The phase of water is determined by the temperature at which the reaction occurs. Most reactions occur at room temperature, $25 ^{\circ }C$, at which water is a liquid. If the temperature is greater than the boiling point, then the water will be a gas.