g Fish are very sensitive to ammonia and even low concentrations can cause toxicity problems. Suppose the pH of a river is 7.5. What is the total molar concentration of ammonia (CT) that can be present without the NH3 concentration rising above 1 mg/L (5.88x10-5 mol/L)

there all right good

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