Calculate the Heat of Reaction ( triangle H) for the following reaction: 2 C 2 H 3 OH (l)+5 O 2 (g) 4 CO 2 (g)+4 H 2 O (g)

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol