Question

Question #f171f

Answer 1

`30 grams`

Explanation:

The molecular weight of `SiO_2` is 60g/mol, so 50.0g is 0.833 moles and there are therefore 0.833 moles of `O_2` available for reaction.

Whatever the reaction is, assuming that all of the oxygen is reacted to form water, and oxygen atoms combine in a 1:2 ratio with hydrogen atoms `2H_2 + O_2 → 2H_2O` we can see that each mole of `O_2` can produce two moles of water. Therefore, the moles of water produced is `2 * 0.833 = 1.67`. The molecular weight of water is 18, so this number of moles will yield `1.67mol * 18g/"mol" = 30g` of water.