Define the term ionization energy. choose one:
a. the amount of energy needed to remove 1 mole of electrons from 1 mole of ground-state atoms or ions in the gas phase.
b. a positively charged particle created when an atom or molecule loses one or more electrons.
c. a relative measure of the ability of an atom to attract electrons in a bond to itself.
d. the amount of energy created by the positive or negative forces of ions.
e. the energy change that occurs when 1 mole of electrons combines with 1 mole of atoms or ions in the gas phase.
f. the energy released when an electron is attracted to a nucleus, thus fulfilling a valence shell octet and creating internal atomic homeostasis

A. The amount of energy needed to remove 1 mole of electrons from 1 mole of ground-state atoms or ions in the gas phase.

Explanation:

Ionization energy is the quantity of energy required to remove an electron in ground electronic state from an isolated gaseous atom or ion, resulting in a cation.  kJ/mol is the expresion we use for this energy, it refers to the amount of energy it takes for all the atoms in a mole to lose one electron each.

 Ionization energy can be used as an indicator of reactivity and can be used to help predict the strength of chemical bonds because the more electrons are lost, the more positive the ion will be and the harder it will be to separate the electrons from the atom.

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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