Chemical Composition and Calculations
Instructions: Write out a linear equation to answer each question.
1. How many molecules of oxygen are found in 3.00 moles of oxygen?
2. How many grams are in 5.87×1021 molecules of sulfur?
3. How many atoms are found in 4.20 g of magnesium (Mg)?
4. How many atoms are found in 3.45 g of CO2?
Instructions: Calculate the mass percent composition of a compound. Show all of your work.
5. Calculate the mass percent of 0.485 g of H, which reacts with oxygen to form 2.32 g H2O.
6. Calculate the mass percent of manganese (Mn) in potassium permanganate (KMnO4).
Instructions: Calculate the empirical or molecular formula for compounds. Show all of your work.
7. A 2.87 g sample of carbon reacts with hydrogen to form 3.41 g of car fuel. What is the empirical formula of the car fuel?
8. Glucose is a carbohydrate that contains carbon, hydrogen, and oxygen. The empirical formula of glucose is CH2O and its molar mass is 180.12 g/mol. Find the molecular formula of glucose.
Instructions: Draw the Lewis Structures for the following molecules. There are free software programs available online that will allow you draw these structures. You can also use drawing tools on your computer or freehand it, take a picture and insert it into this document.
Instructions: Draw the resonance structures for the following compounds.
Instructions: Give the molecular geometry and the bond angles for the following compounds.
Instructions: There are various types of covalent bonds. Determine if the following molecules are polar, nonpolar, or ionic compounds.
Instructions: Provide the name of each of the following acids.
Instructions: Provide the molecular formula for the following acids.
5. Hydrocyanic acid
6. Nitrous acid