The brønsted-lowry definition of acids and bases is more specific than the arrhenius definition because of which factor? a. the brønsted-lowry definition includes acids and bases that are found in water. b. the brønsted-lowry definition focuses on whether a substance accepts or donates h+ ions. c. the brønsted-lowry definition focuses on the ph of a substance. d. the brønsted-lowry definition focuses on whether a substance accepts or donates hydrogen pairs.

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