1. All organisms are composed of… A. one or more cells, because they are the basic unit of life.
B. air because all organisms breathe.
C. one or more organs because all organisms are complex.
D. blood because all organisms have circulator systems.

ugh fiel iente of insistí is did kiwis jaj

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

c. 4.54 x 10–12 j happens to be correct