A scientist wanted to test his new simple distillation instrument. He decided to distill some seawater as a first trial and some diluted rum (ethonal/water mixture) as a second trial. For his first trail, he allowed the temprature to reach up to 100° because that is the boiling point of pure water. The boiling point of ethanol in the dilute rum is 78° a)What is the distillate in the first trial?
b)What would have been the maximum temperature for the 2nd trial?
c)What was the distillate in the second trial?

the volume increases

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