Question

Determine the theoretical and percent yield of hydrogen gas if 74.0 g water undergoes electrolysis to produce hydrogen and oxygen and 2.61 g hydrogen is collected.

Answer 1

You need to start with the balanced chemical equation for the reaction.

Answer 2

done

Answer 3

Now, convert the 74.0 g H2O to grams of H2 using stoichiometry. This answer will be the theoretical (or maximum) yield.

Answer 4

how

Answer 5

You'll need to molar mass of the water. Do you know how to find that using the periodic table?

Answer 6

74.0g H_2O *mole/mass of mole of water *1 mole H_2:1mole H_2O should give you what you need