Final Exam Rev#2 Ch.2

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

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?

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?

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

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 was the % of water in the hydrate?