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A molecule of water has two atoms of hydrogen and one atom of oxygen. If the water is pure with no impurities in it, we can calculate the amount of...
A molecule of water has two atoms of hydrogen and one atom of oxygen. If the water is pure with no impurities in it, we can calculate the amount of hydrogen present in each water molecule. Each hydrogen atom has a mass of 1.00797 atomic mass units (the unit of measure for atoms, abbreviated as amu) while oxygen has a mass of 15.999 atomic mass units. A molecule of water hydrogen has a mass of 1.00797 + 1.00797 + 15.999 = 18.01494 atomic mass units. Let us calculate the fraction of hydrogen present in a water molecule. Recall what the term "fraction" represents. If you eat ¼ of an apple, it means you ate one piece out of a total of four pieces. So to write the fraction of hydrogen in water, you must divide the mass (in amu) of two atoms of hydrogen with the total mass (in amu) of a water molecule. Your answer is simply a ratio and will have no units.
