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Unformatted text preview: We can also calculate the mass of a mole of molecules. What is the mass of a mole of methane ( CH 4 ) molecules? mass of 1 mole of C is 12.011 g mass of 4 moles of H is 4 X 1.00g mass of 1 mole of CH 4 is 16.043 g In other words the molecular weight of CH 4 is 16.043g. Molecular weight = the mass in grams of 1 mole of a molecule. For ionic compounds, which do not exist as individual molecules we use the term Formula weight Formula weight = The mass in grams of 1 mole of the chemical formula. What is the formula weight of CaCO 3 ? mass of 1 mole of Ca is 40.08 g mass of 1 mole of C is 12.011 g mass of 3 moles of O is 3 X 15.999 g Formula weight of CaCO 3 is 100.09 g Let's look at another example. How many hydrogen atoms are there in 2.50 g of NH 3 ?...
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