IONIZATION ENERGY 1. Use the interactive periodic table found at www. chemicool. com to help
you answer the following questions.
2. Find the first ionization energy of the first three elements in rows two, three,
and four.
Li
Be
B
Na
Mg
AI
K
Са
Ga

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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