Percentage Composition Notes

# Percentage Composition Notes - compound Step1 CONVERT FROM...

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Percentage Composition Notes In determining the percent composition of substances, follow these simple rules: 1. Determine the molar mass of the substance. 2. Determine the percentage each element makes up of the whole. Total mass of element x 100 Molar Mass Example 1 : Determine the percent composition of methane, CH 4 . Step 1: Step 2: Example 2 : Find the percent by mass of each element in Al 2 S 3 . Example 3 : Find the percent by mass of chlorine in MgCl 2 . Calculating Empirical Formulas

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Definition : An empirical is the __________________whole-number ratio of the elements in a
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Unformatted text preview: compound. Step1: CONVERT FROM GRAMS TO MOLES. Step 2: DIVIDE EACH BY THE SMALLEST NUMBER OF MOLES. Example #1 : What is the empirical formula of a compound that is 78.1% boron and 21.9% hydrogen? B : H : Example #2 : Quantitative analysis shows that a compound contains 32.8% sodium, 22.65% sulfur, and 44.99% oxygen. Find the empirical formula of this compound. Na : S : O : Example #3 : Quantitative analysis shows that a compound contains 28.4% copper and 71.6% bromine. What is the empirical formula of the compound?...
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Percentage Composition Notes - compound Step1 CONVERT FROM...

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