In which species does nitrogen have the highest oxidation number?
Select one:
a. NH3
b. N2
c. NaNO3
d. NO2-
e. HNO2

NaNO3

Explanation:

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