Verified answer

1.

[tex]n(O2)= V/Vm = 44,8/22,4 = 2 моль[/tex]

2.

[tex]2H2+ O2 {}^{2} = 2H2O {}^{x} [/tex]

3.

[tex] \frac{2}{1} = \frac{x}{2} [/tex]

[tex]x = \frac{2 \times 2}{1} = 4[/tex]