Answer: Chemical equation for the overall reaction obtained by adding these three given equations is:
[tex]2NO_2(g)\rightarrow N_2O_4(g)[/tex]
Explanation:
[tex]2NO_2(g)\rightarrow2NO(g)+O_2(g)[/tex]...(1)
[tex]2NO(g)\rightarrow N_2(g)+O_2(g)[/tex]...(2)
[tex]N_2(g)+2O_2(g)\rightarrow N_2O_4(g)[/tex]...(3)
If the same compounds is on same sides in the reactions then add them.
If the same compound is on different sides of the reaction then subtract.
Adding (1) and (2)
[tex]2NO_2(g)+2NO(g)\rightarrow 2NO(g)+O_2(g)+N_2(g)+O_2(g)[/tex]
NO is present on both sides, which means it will get cancel out. [tex]O_2[/tex] is on same side it will get added up.
[tex]2NO_2(g)\rightarrow N_2(g)+2O_2(g)[/tex]..(4)
Similarly, on adding (3) in (4) we get:
[tex]2NO_2(g)\rightarrow N_2O_4(g)[/tex]
Above equation is obtained by adding given three equations.
