Answer: You will need to use the chemical formula of the compound and the average atomic masses from the periodic table to calculate molecular mass . Explanation:Let's look at the example of water. I'll round average atomic masses to two places beyond the decimal. You should adjust your rounding based on your teacher's preferences. H2O = two atoms of H and one atom O in a single molecule H = 1.01 (use the average atomic mass from the periodic table) O = 16.00 To find molecular weight: H = 1.01 x 2 = 2.02 (have to multiply by two since water has two hydrogen atoms) O = 16.00 x 1 = 16.00 The total molecular weight is 18.02 - this was found by adding the total mass from H with the total mass from O. This will also be the molar mass of water Here are a couple more examples: I hope this helps!
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Noel PaullerThank for visiting my blog where I post thoughts from the random corner of the universe which is my brain. Archives
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