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Warm-Up! (Day 1) What is the empirical formula of a compound that is composed of 0.608% Nitrogen and 1.388% Oxygen ?

What is the molecular formula if the compound from the above weighs 92.02g?

HydrateswaterHydrates: solid ionic compounds in which water molecules are trapped

Opal: hydrated silica SiO2nH2OFormulas of Hydrates

Finding the Formula of Hydrates

Finding the Formula of HydratesNeed to dry out the sample Anhydrous= without water (dried substance)

2. Find the difference between the original and dried massMass of Hydrate Mass of Anhydrous = Mass of Water

3. Convert the mass of water and dried substance to moles using the fence diagram

4. Divide both moles by the smaller number to get a ratio

PracticeWhen 100g of hydrated BaBr2 is dried, it weighs 89.2g. Find the formula of the hydrate.Try these! (on a separate piece of paper)When 100g of hydrated CaSO3 is dried, it weighs 76.9g. Find the formula of the hydrate.

0.737g of MgSO3 reacts with 0.763g of H2O to form a hydrate. Find its formula.