Please help with Chemistry Question!

Question

Consider the reaction of hydrogen and oxygen producing water. If 26.1 g of water is produced and 23.0 g of oxygen is used how many grams of hydrogen are needed?

Answer 1

@Edward W. presents the correct answer, but I thought you might want an explanation as to how one might arrive at that answer.

Write the balanced equation:

2H₂ + O₂ ==> 2H₂O

26.1 g H₂O x 1 mol H₂O/18 g = 1.45 moles H₂O produced

23.0 g O₂ x 1 mol O₂/32 g = 0.719 moles O₂ used

Since the mole ratio of H₂ to O₂ is 2:1, this means 0.719 x 2 = 1.44 moles H₂ would be used.

1.44 moles H₂ x 2 g/mol = 2.88 g H₂ were used

Answer 2

2.8g Hydrogen