 So the first one we want to have a look at is one we have already looked at before which is combustion of alcohols. So when we were looking at the calculating experimentally the enthalpy or the molar enthalpy of combustion of alcohols we used this particular equation which is the combustion of ethanol. So in this case when ethanol combusts in oxygen we produce carbon dioxide and water and this is going to assume complete combustion. Of course if there is low oxygen then we may find that carbon monoxide or even carbon as soot can be produced instead of carbon dioxide. Water of course is always going to be one of our products. The products of these combustion reactions assuming complete combustion will be the same and you just change the alcohol and get some practice writing some of these different equations down.