Which best describes the importance of the microscope to the development of cell theory? microscopes color different parts of cells so they can be seen with the naked eye. cells are too small to see with the naked eye, and a microscope magnifies them. the lenses in a microscope reduce the image of an organism to the size of a cell. microscopes trap “animalcules” from pond water so they can be studied.

The correct answer is B hope this helps

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