Hydrates Calculations Practice

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?

• MgCO₃ · 5H₂O
• MgCO₃ · 4H₂O
• MgCO₃ · 6H₂O
• MgCO₃ · 1H₂O

Tags

NGSS.HS-PS1-7

A 4.175 gram sample of a certain hydrate of copper (II) sulfate, CuSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 3.120 grams. What is the formula of the hydrate?

• CuSO4•H2O

• CuSO4•3H2O

• CuSO4•6H2O

• CuSO4•4H2O

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

A 5.018 gram sample of a certain hydrate of magnesium sulfate, MgSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 2.449 grams. What is the formula of the hydrate?

• MgSO4•9H2O

• MgSO4•8H2O

• MgSO4•7H2O

• MgSO4•6H2O

Tags

NGSS.HS-PS1-7

What is the chemical formula for calcium sulfate hexahydrate?

• CaSO₄ * 6H2O

• Ca2(SO4)3 * 6H2O

• Ca(SO4)2 * 6H2O

• Ca3(SO4)3 * 6H2O

How are anhydrous compounds different from hydrates?

• Anhydrous compounds contain more water molecules than hydrates

• Anhydrous compounds and hydrates are the same

• Anhydrous compounds do not contain water molecules, unlike hydrates

• Anhydrous compounds use Greek letters to indicate the number of water molecules present

What is the formula for Copper(II) sulfate pentahydrate?

• CuSO4

• CuSO4·5H2O

• CuSO4·H2O

• Cu2SO4·5H2O

A 15.67 g sample of a hydrate of magnesium carbonate was heated to drive off the water. The mass was reduced to 7.58 g. What is the formula of the hydrate?

• MgCO₃ · 5H₂O
• MgCO₃ · 4H₂O
• MgCO₃ · 6H₂O
• MgCO₃ · 1H₂O

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7