The bond dissociation energies for aa, bb, and ab are 7.55, 7.44, and 8.62 ev, respectively. calculate the
difference the electronegativities of a and b on the pauling scale.
select one:
a. 1.06
b. 1.01
c. 1.02

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