Verified answer

1.

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

3.

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

4.

[tex]m(H2O)= n×Mr = 4×18= 72 г[/tex]