Let's calculate the weight percent H in the water in this glass.
Atomic Mass: H = 1.0 amu O = 16.0 amu
1. There are 2.0 grams of H in 1 mole of H2O.
2. What is the gram-molecular weight of H2O?
1.0 grams 2.0 grams 16.0 grams 18.0 grams