Each copper(II) sulfate unit is associated with five water...

Each copper(II) sulfate unit is associated with five water molecules in crystalline copper(II) sulfate pentahydrate $\left(\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O}\right)$. When this compound is heated in air above $100^{\circ} \mathrm{C},$ it loses the water $\mathrm{mol}-$ ecules and also its blue color:$$\mathrm{CuSO}_{4} \cdot 5 \mathrm{H}_{2} \mathrm{O} \longrightarrow \mathrm{CuSO}_{4}+5 \mathrm{H}_{2} \mathrm{O}$$ If $9.60 \mathrm{~g}$ of $\mathrm{CuSO}_{4}$ are left after heating $15.01 \mathrm{~g}$ of the blue compound, calculate the number of moles of $\mathrm{H}_{2} \mathrm{O}$ originally present in the compound.

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Hydrates

Hydrates are crystalline compounds that include water molecules within their solid structure. These water molecules, known as water of crystallization, are incorporated in fixed ratios with the main salt, and heating the compound typically removes these water molecules without altering the salt’s composition.

Mole Concept

The mole is a fundamental unit in chemistry that represents a specific number of particles, usually atoms or molecules. It provides a bridge between the mass of a substance and the number of entities it contains, allowing for quantitative chemical calculations.

Molar Mass

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole. It is used to convert between the mass of a substance and the number of moles, which is crucial in stoichiometric computations and quantitative chemical analysis.

Stoichiometry

Stoichiometry involves the quantitative relationships between reactants and products in a chemical reaction. In the context of hydrates, it provides the ratios between the anhydrous compound and the water of crystallization, allowing one to determine how many moles of water are released or originally present based on the moles of the salt.

Transcript

Please give Ace some feedback