What is the concentration of chloride ion in a solution made by mixing 110.0 mL of 2.00 M barium chloride and 250.0 mL of 0.450 M sodium chloride

I have no clue I am just answering this for the points

Explanation:

Lol

beta decay is the answer

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