Chemical Compositions And Calculations

Module Three Assignment


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?


  1. How many grams are in 5.87×1021 molecules of sulfur?


  1. How many atoms are found in 5.20 g of magnesium (Mg)?


  1. 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.

  1. Calculate the mass percent of 0.485 g of H, which reacts with oxygen to form 2.32 g H2


  1. 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.

  1. 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?


  1. 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.


Chemical Bonding

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.

  1. ZnCl2


  1. CH4


  1. NI3


  1. H2O

Instructions: Draw the resonance structures for the following compounds.

  1. NO3

Instructions: Give the molecular geometry and the bond angles for the following compounds.

  1. H2O


  1. CCI4


  1. CO2


  1. NH3

Instructions: There are various types of covalent bonds. Determine if the following molecules are polar, nonpolar, or ionic compounds.

  1. NaCl


  1. CH4


  1. BH3


  1. H2O


  1. CHCI3



Naming Acids

Instructions: Provide the name of each of the following acids.

  1. HBr
  2. HF
  3. HC2H3O2
  4. HNO3

Instructions: Provide the molecular formula for the following acids.

  1. Hydrocyanic acid
  2. Phosphoric acid


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