The reaction between hydrogen and oxygen to form water is given as:
[tex]H_2 + O_2 \rightarrow H_2O[/tex]
The balanced reaction is:
[tex]2H_2 + O_2 \rightarrow 2H_2O[/tex]
According to the balanced reaction,
4 g of hydrogen ([tex]4\times 1[/tex]) reacts with 32 g of oxygen ([tex]2\times 16[/tex]).
So, oxygen reacted with 29.4 g of hydrogen is:
[tex]\frac{29.4\times 32}{4} = 235.2 g[/tex]
Hence, the mass of oxygen that is reacted with 29.4 g of hydrogen is 235.2 g.