If climate change is brought under control, which of the following would be most likely?
a. a decrease in ocean temperatures and a decrease in coral bleaching.
b. a decrease in ocean temperatures and an increase in coral bleaching.
c. an increase in ocean temperatures and an increase in coral bleaching.
d. an increase in ocean temperatures and a decrease in coral bleaching.

A

Explanation:

Because Coral bleaching happens when the ocean temperature increases. And when climate change is under control, then ocean temp would decrease making coral bleaching  also decrease.

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