How does the water in an estuary compare to the water in the open ocean? Estuaries have less concentrated nutrients and salt.

Estuaries have more concentrated nutrients and salt.

Estuaries have less concentrated nutrients and more concentrated salt.

Estuaries have more concentrated nutrients and less concentrated salt.

the 4th one

Explanation:

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