In very early attempts to classify organisms, the Greek philosopher, Aristotle, identified all animals as "air dwellers, land dwellers, or water dwellers". Under this system, all of the following organisms
would have been placed in the same group: Bat, grasshopper, eagle, butterfly, flying squirrel, and
sparrow. In the space below, construct a dichotomous key that can be used to identify these 6
animals,

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

thats not the answer u need to drop the right one bruh