Complete the Lewis structures for pyrazine (C5H4N2) showing the two most common resonance forms. Draw the Lewis structures with the formal charges minimized.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

answer: mole of the gas

answer: mole of the gasexplanation:

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