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Formula Weights and Percentage Composition
Section 3.3 Formula Weights and Percentage Composition
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Formula Weights Sum of the atomic weights of each atom in its chemical formula We did this with empirical/molecular problems Formula Weights are also Molecular Weights for molecules
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Molecular Weights How do we calculate the molecular weight of a compound? add atomic weights of each atom The molecular weight of propane, C3H8, is: 32
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Molecular Weights The molecular weight of calcium nitrate, Ca(NO3)2 , is: You do it! 32
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Formula Weights, Molecular Weights, and Moles
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Percent Composition % composition = mass of an individual element in a compound divided by the total mass of the compound x 100% Determine the percent composition of C in C3H8. 45
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Percent Composition and Formulas of Compounds
What is the percent composition of H in C3H8? You do it! 46
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Percent Composition and Formulas of Compounds
What is the percent composition of H in C3H8? 47
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Percent Composition and Formulas of Compounds
Example: Calculate the percent composition of Fe2(SO4)3 to 3 significant figures. You do it! 48
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Percent Composition and Formulas of Compounds
Example 2-10: Calculate the percent composition of Fe2(SO4)3 to 3 sig. fig. 49
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Homework Problems on page 112 in textbook
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