Answer
Please see the work below.
Work Step by Step
We know that
The reactions of lithium
$2Li+2H_2O\rightarrow 2LiOH+H_2$
$4Li+O_2\rightarrow 2Li_2O$
The reaction of sodium is given as
$2Na+2H_2O\rightarrow 2NaOH+H_2$
$2Na+O_2\rightarrow Na_2O_2$