Answer :
The ΔH° rnx for the reaction is -158 kJ/mol.
Firstly, we need to calculate the enthalpy change of the reaction.
we know that
ΔH° rnx = [tex]\sum bonds broken in reactant + \sum bonds formed in product[/tex]
We have to draw the Lewis structure for each of the molecule in the reactants and product.
Total valence electrons of HCN = 1+ 4 +5 = 10
Total valence electrons of [tex]CH_3NH_2[/tex] =4+3+5+2 = 14
= [ 1+ 1 + 2 ] + [3 + 1 + 2 ]
= [1 (413 kJ) + 1(891 kJ) + 2 (432 kJ)]+ [3 (-413 kJ) + (- 305 kJ) + 2 (-391 kJ)]= -158 kJ
The ΔH° rnx for the reaction is -158 kJ/mol.
What is a chemical reaction?
- A chemical reaction is a procedure that causes one group of chemical components to change chemically into another.
- Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present).
- The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.
- Reactants or reagents are the initial substances used in a chemical reaction.
- Chemical reactions typically involve a chemical change and produce one or more products, which typically differ from the reactants in some ways.
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