Percent Composition
Published on Feb 24, 2016
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PRESENTATION OUTLINE
Percent Composition of Hydrates
- Hydrates - crystal structures that incorporate water into their structures.
- When you measure a certain quantity of the compound, you need to know how much the water molecules contribute to the mass.
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Reading a Hydrate Formula
- When a compound is crystallized from a water solution, there is water present.
- That water is reflected in the chemical formula.
- i.e. - CuSO4*5H2O
Photo by Paul's Lab
Reading a Hydrate Formula
- CuSO4*5H2O
- You will notice that 1 mole of CuSO4 contains 5 mols of H2O.
- The water molecules attribute to the total mass of the formula
Photo by Paul's Lab
Calculating Percent Water in a Hydrate
- Since the water contribute to the total mass
- You have to treat the water molecule as if it were another element in the formula.
Photo by Macroscopic Solutions
Calculating Percent Water in a Hydrate
- Find the formula mass of H20
- multiply it by the number of moles in the formula
- divide by the total mass of the compound CuSO4*5H2O
Photo by Macroscopic Solutions
