On the basis of electronegativity, which pair of elements is most likely to form a polyatomic ion?

a. cs and cl

b. ba and o

c. o and p < -- i believe this is correct.

d. na and br

C is the correct answer!

Explanation:

O and P have a minimum of electronegativity so they are more likely to create a poly ion

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