Hydrates & Percent Water

A 4.4 gram sample of a hydrate was heated until the water of hydration was driven off. The anhydrous compound remaining had a mass of 3.3 grams. What is the percentage by mass of water in the hydrate?

• 75%

• 33%

• 67%

• 25%

Calculate the molar mass (mass of 1 mole = gram formula mass) of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

What is the correct name for the compound, CaSO4•2H2O?

• carbon sulfate dihydrate

• calcium sulfur oxide dihydrate

• calcium sulfide dihydrate

• calcium sulfate dihydrate

• calcium sulfite dihydrate