Understanding Moles and % Composition

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Presentation transcript:

Understanding Moles and % Composition Intro to Empirical and Molecular Formulas

What is the mass of 1 mol of Chlorine? What term describes this measurement?

What is the molar mass of chlorine Gas?

What is the molar mass of HCl?

What is the molar mass of water?

What is the chemical equation for water? How many moles of Hydrogen and oxygen gas, and water are present?

Molar mass= mass of 1 mol What is the molar mass of the compound Al2(SO4)3? What is the molar mass of 2 Al2(SO4)3?

% composition What is the % composition of water?

Could you determine the formula of a compound given the % composition of the compound?

Empirical Formula Is the smallest WHOLE number ratio for a compound.

Empirical formula for water

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.

Share responses from yesterday’s warm-up!!!

Determine the % composition of glucose. Use those percentages to determine the empirical formula. What do you notice?

Molecular formula Specifies the actual number of moles in a compound.

Molecular formula of Glucose What is the mass of the empirical formula of glucose? What is the MOLAR mass of glucose? Divide your molar mass of glucose by the mass of your empirical formula. What is the relationship? Distribute across the empirical formula!

Homework Unit 5- Worksheet 3 Attached on Engrade Calendar Emailed via Engrade as well