Wheat has been bred by farmers for thousands of years to improve its ability to be ground into flour. This is an example of what kind of biotechnology? A. The engineering of eggplant to make it produce fruit in winter B. The engineering of yeast to contain an enzyme used for making cheese C. The engineering of fruits so that they ripen slower and can be shipped farther D. The engineering of rice crops to withstand flooding and contain more nutrients

i think is conclusions.i think so

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