Answer:
116g/mol
Explanation:
Mg=24
NO2=46
multiple 46 by 2and then add 24
the answer is Te because O is oxygen.
The reaction between hydrogen and oxygen to form water is given as:

The balanced reaction is:

According to the balanced reaction,
4 g of hydrogen (
) reacts with 32 g of oxygen (
).
So, oxygen reacted with 29.4 g of hydrogen is:

Hence, the mass of oxygen that is reacted with 29.4 g of hydrogen is 235.2 g.