Bell Work: Interpret the Formula

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Presentation transcript:

Bell Work: Interpret the Formula How many of each element are in these compounds? SO4 C3H8 CrO4-2 NH4+ Br2

Formula Mass To find the formula mass of a compound, add up the masses of all parts of the formula Example: CaF2

Formula mass: MgSO4

Formula mass: C5H12

Formula mass Find the formula mass of each of the following: KOH Fe2O3 CuPO4 C2H3O2-

Percent Composition Find how much of each element is in a compound

Percent Composition: CH2

Percent Composition: H2O

Percent Composition: NO3-

Percent Composition: AgC2H3O2

Bell Work Determine the formula mass of NaNO3 Find the percent composition of BaSO4

Percent Composition of Hydrates Hydrates are substances that contain water as part of their formula Examples: MgSO4 • 7H2O or Na2CO3 • 10H2O

Percent Composition of Hydrates Find the percentage of water in the compound CuSO4 • 5H2O

Percent Composition of Hydrates A 5.0 g sample of a hydrate of BaCl2 was heated, and only 4.3 g of the anhydrous salt remained. What percentage of water was in the hydrate?