As a solution of copper sulfate slowly evaporates, beautiful...

As a solution of copper sulfate slowly evaporates, beautiful blue crystals form. Their chemical formula is $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$ a. What is the percent water in this compound? b. At high temperatures the water is driven off as steam. What fraction of the original sample's mass is lost as a result?

As a solution of copper sulfate slowly evaporates, beautiful blue crystals form. Their chemical formula is $\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}$
a. What is the percent water in this compound?
b. At high temperatures the water is driven off as steam. What fraction of the original sample's mass is lost as a result?

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Key Concepts

Hydrates

Hydrates are compounds that include water molecules bound within their crystalline structure in a definite proportion. The water molecules, also known as water of crystallization, are typically represented in the compound’s formula after a dot, indicating they are part of the solid compound but can be removed by processes such as heating.

Percent Composition by Mass

Percent composition by mass is the calculation that determines what percentage each component of a compound contributes to the total mass. In the context of hydrates, it involves determining the mass of the water molecules relative to the entire molar mass, which is essential for understanding changes when water is removed by heating.

Molar Mass Calculation

Molar mass calculation is the process of summing the atomic or molecular masses of all atoms in a compound to determine the mass of one mole of that substance. For hydrates, it requires the additional step of including the mass of the water molecules, which is critical for computing percent composition and assessing mass changes during processes like dehydration.

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