3. What is the most accurate statement concerning ionization energy? O A. Metals tend to have lower ionization energies than nonmetals.
O B. As you move down a group on the periodic table, ionization energy tends to increase.
O C. As you move across a period from left to right on the periodic table, ionization energy tends to decrease
O D. The noble gases tend to have the lowest ionization energies.

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

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