The ∆Hrxn of the reaction is -394.5kJ/mol.
<h3>What is alkaline earth metal? </h3>
The alkaline earth metals are those elements which correspond to group 2 of the modern periodic table.
All elements of this group forms a cation of +2 charge.
The other elements of this group are:
Beryllium, Magnesium, Calcium, Strontium, Barium, and Radium.
<h3>What is Halogen? </h3>
The Halogen elements are present in group 17 of the modern periodic table.
All elements of this groups forms anions of -1 charge.
The elements of this group are:
Fluorine, Chlorine, bromine, iodine, and astatine.
∆Hrxn = ∆H(bond broken) - ∆H(bond formed)
We have following data of bond energy in kJ/mol:
Mg—Mg = 738
Cl—Cl = -349
Mg—Cl = 783.5
Since, one mole of Mg react with one mole of Cl atom to form one mole of MgCl
∆Hrxn = 738-349-783.5
∆Hrxn = -394.5kJ/mol.
Thus, we concluded that the ∆Hrxn of the reaction is -394.5kJ/mol.
learn more about bond energy:
brainly.com/question/13526463
#SPJ4
