The atomic weight of hydrogen is 1.0079 Amu and the atomic weight of oxygen is 15.999 amu. Using the information, what is the molecular weight of a molecule of water, H2O? (Amu= atomic mass unit) HELP PLEASE Good Day.... Problem: What is the molecular weight of a molecule of water, H2O? (Amu= atomic mass unit) Given Data: Oxygen = 15.999 atomic mass unit (amu) Hydrogen = 1.0079 atomic mass unit (amu) Note: H2O contains 2 atoms of hydrogen and 1 atom of Oxygen Hydrogen = 1.0079 amu × 2 = 2.0158 amu (H2) Oxygen = 15.999 amu × 1 = 15.999 amu (O) Solution: Add the atomic mass unit of 2 hydrogen to the atomic mass unit of 1 oxygen. H2O = 2.0158 amu + 15.999 amu = 18.0148 amu We can also say that 1 mole of H2O is equal to 18.0148 grams. Molar mass of H2O = 18.0148 grams/mol Answer: H2O has 18.0148 atomic mass unit ( amu ) H2O has a molar mass of 18.0148 grams / mol Hope it helps...=)
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