When there is a lack of water, you might notice that a plant (4)___This is because normally water moves
in and out of the plant through a process called
(5)___, and is stored in the (6)___ The water
within the plant helps to hold it up, which is called
(7) ___, a type of (8)___.

i think its 5049.

i hope this !

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