Unit 9 Notes
Calculating Percent Composition: Empirical and Molecular Formula Problem Sodium hydrogen carbonate (NaHCO​
), also called baking soda, is an active ingredient in some 3​
antacids used for the relief of indigestion. Determine the percent composition of NaHCO​
3 Empirical Formula: Problem Methyl acetate is a solvent commonly used in some paints, inks, and adhesives. Determine the empirical formula for methyl acetate, which has the following chemical analysis: 48.64% carbon, 8.16% hydrogen, and 43.20% oxygen. Molecular Formula: Problem Succinic acid is a substance produced by lichens. Chemical analysis indicates it is composed of 40.68% carbon, 5.08% hydrogen, and 54.24% oxygen and has a molar mass of 118.1 g/mol. Determine the empirical and molecular formulas for succinic acid. Calculating and empirical formula from mass data: Problem The mineral ilmenite is usually mined and processed for titanium, a strong, light, and flexible metal. A sample of ilmenite contains 5.41 g of iron, 4.64 g of titanium, and 4.65 g of oxygen. Determine the empirical formula for ilmenite. Naming Hydrates: Analyzing a Hydrate: Problem A mass of 2.50 g of blue, hydrated copper sulfate (CuSO​
•​
x​
H​
O) is placed in a crucible and 4​
2​
heated. After heating, 1.59 g of white anhydrous copper sulfate (CuSO​
) remains. What is the 4​
formula for the hydrate? Name the hydrate.