Which gas propane or butane gives off the least amount of water vapour when burned?

Question

Which gas propane or butane gives off the least amount of water vapour when burned?

Answer 1

Neither of them contain H2O into their composition.

Propane: C3H3

Butane: C4H10

Answer 2

to the above answer they dont contain H2O but it is produced by combustion

Depends how much gas your burning

http://en.wikipedia.org/wiki/Propane

http://en.wikipedia.org/wiki/Butane

Answer 3

propane burns completely according to the following equation

C3H8  +  5 O2  ----->  4H2O  +  3CO2

Butane:

C4H10  +  13/2   O2  --------->   5H2O  +  4CO2

Hence for the same mole of propane and butane, propane will produce the least amount of water vapour

Answer 4

Compare the balanced equations:

C3H8 + 5O2  ==>  3CO2 + 4H2O

C4H10 + 13/2 O2  ==>  4CO2 + 5H2O

Each mole of propane produces 4 moles of H2O while a mole of butane produces 5 moles of H2O. On a per mole basis, propane gives off less H2O. On a mass basis, gram per gram, propane gives off slightly more.

Answer 5

The propane molecules, as they contain less hydrogen than butane, will require less oxygen for complete combustion and will produce less water vapour than the same volume of butane.