No equation is not balanced,
[tex] 4Al+ 2O_{2} \ \textgreater \ 2Al_{2}O_{3} [/tex]
Right now this is your equation.
in the first part or the part of the reactants we have 4 Al and on the product we have also 4 but in O in the reactants there are 4 but there are 6 on the products.
For the equation to be balanced it should be:
[tex] 4Al+ 3O_{2} \ \textgreater \ 2Al_{2}O_{3} [/tex]
