Please help me my project is due in 20 june 2020 i need help 2 physical changes that happen in aquaponics and endothermic reactions that happen in aquaponics 3 chemical changes that happend in aquaponics A conclusion about matter and energy and explain how both can change ecosystems and earth surface with time.

the right answer is c i just did the question.

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