What is true of an Arrhenius base? A. An Arrhenius base produces OH-ions.
B. An Arrhenius base accepts Hi ions.
C. An Arrhenius base accepts OH ions.
D. An Arrhenius base produces H+ ions.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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