Hydrates

What is the correct chemical formula for barium hydroxide octahydrate?

• Ba . 8(OH)₂

• 8Ba(OH)₂ . H₂O

• Ba(OH)₂ . 8H₂O

• Ba(OH)₂ . H₂O

Name the following ionic compound: MgSO₄ · 7H₂O

• magnesium sulfate heptahydrate

• magnesium sulfate pentahydrate

• magnesium sulfide heptahydrate

• magnesium sulfate octahydrate

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?

Molar Mass MgSO₄: 120.37 g/mol

Molar Mass Water: 18.02 g/mol

• MgSO₄•6H₂O

• MgSO₄•9H₂O

• MgSO₄•8H₂O

• MgSO₄•7H₂O

A 5.00 g sample of hydrated barium chloride, BaCl₂ · nH₂O, is heated to drive off the water. After heating, 4.26 g of anhydrous barium chloride, BaCl₂, remains. What is the formula of the hydrate?

Molar Mass: BaCl₂: 208.23 g/mol

Molar Mass Water: 18.02 g/mol

• BaCl₂ · 2H₂O

• BaCl₂ · 3H₂O

• 2BaCl₂ · H₂O

• BaCl₂ · 5H₂O

A calcium chloride hydrate has a mass of 4.72 g. After heating for several minutes the mass of the anhydrate is found to be 3.56 g. Use this information to determine the formula for the hydrate.

Molar Mass CaCl₂: 110.98 g/mol

Molar Mass Water: 18.02 g/mol

• CaCl₂ · 3 H₂O

• CaCl₂ · 2 H₂O

• CaCl₂ · 5 H₂O

• 2CaCl₂ · H₂O