How many atoms are in 19.06 grams of H2O?
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The molar mass of H20 is about 18 g/mol. (Meaning 1 mole, or 6.022 * 10^23, of H2O molecules weighs 18 grams). 9 is 1/2 of 18, meaning that 1/2 mole is present in 9 g of water. 1/2 * 6.022 * 10^23 = 3.011 * 10^23 molecules H2O.
However, if you want to know how many ATOMS are present in 3.011 * 10^23, you must then multiply by 3 (2 hydrogen atoms and 1 oxygen atom per molecule), and get 9.033 * 10^23 atoms.
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