Question: what is the mass percent of hydrogen in water quizlet?
Answer: There is also one mole of oxygen atoms weighing 16.00 grams in the mole of water. To get the percentage of hydrogen, divide the 2.016 by 18.015 and multiply by 100, giving 11.19%. For oxygen it is 16.00 ÷ 18.015 = 88.81%.