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  • Science
    • Biology
      • Natural Selection
    • Chemistry
      • Balancing Chemical Equations
      • Covalent Bonds
      • Energy Diagrams
      • Excited Electrons
      • Flame Test
      • Fusion and Fission
      • Half-Life
      • Heat Transfer
      • Intermolecular Forces
      • Ionic Bonds
      • Isotopes
      • Lewis Dot Structures
      • Matter (Part 1)
      • Matter (Part 2)
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      • Periodic Table (Part 1)
      • Periodic Table (Part 2)
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Unit 11: Cleaning Dangers
11.8: Mole Ratios and Molar Mass

Mole Ratios

When you are completing mole ratios, you always need to start with a balanced chemical equation. Once you have a balanced chemical equation, you can use the ratio to predict how much product will form from reactants, or how much reactant is needed to produce a specific amount of product. Watch the following video to see how this is done using mole ratios.
https://youtu.be/1XQyN-et6bI
Watch the following video from 0:00 to 6:00 to learn more about mole ratios and how to use mole ratios in stoichiometry. If you need additional review, please watch the video further. ​
https://youtu.be/S6UQX7ZdkTg

Molar Mass

Picture
Picture

The atomic mass of an element is the weight in grams of 1 mole of atoms. This is also called the molar mass. For example,
  • 1 mole of sodium (Na) weighs 22.990 grams, so the molar mass of Na is 22.990 grams/mole.
  • 1 moles of Chlorine (Cl) weighs 35.45 grams, so the molar mass of Cl is 35.45 grams/mole
  • 1 molar mass of NaCl would be 22.990 + 35.45 = 58.44 grams/mole
Watch the following video from 0:00 to 6:42 to learn about molar mass.
https://youtu.be/Qflq48Foh2w
The molar mass is used to convert between grams and moles. Watch the following video to learn about how to do these types of conversions.
https://youtu.be/zWzA-T54pPI
For additional practice with solving mass to moles stoichiometry problems, click on the button below labeled "Moles to Mass Practice Problems."
Moles to Mass Practice Problems

Percent Composition By Mass

Watch the following video for how to determine the percent composition by mass.
https://youtu.be/lywmGCfIUIA

Empirical Formulas and Molecular Formulas

Watch the following video to learn about the empirical formula and the molecular formula.
https://youtu.be/wnRaBWvhYKY
Watch the following video to learn about how to calculate the empirical formula of a compound.
https://youtu.be/xjnfga0BwCs
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  • Home
  • Tips and Tricks Blog
  • Science
    • Biology
      • Natural Selection
    • Chemistry
      • Balancing Chemical Equations
      • Covalent Bonds
      • Energy Diagrams
      • Excited Electrons
      • Flame Test
      • Fusion and Fission
      • Half-Life
      • Heat Transfer
      • Intermolecular Forces
      • Ionic Bonds
      • Isotopes
      • Lewis Dot Structures
      • Matter (Part 1)
      • Matter (Part 2)
      • Organic Chemistry
      • Periodic Table (Part 1)
      • Periodic Table (Part 2)
      • Physical Changes and Chemical Reactions
      • Radioactive Decay
      • Solutions and Separation Methods
      • The Atom
      • What is Chemistry?
    • General Science Topics
      • CER
      • Good Research
      • Graphing
      • Lab Equipment
      • Lab Safety
      • Models
      • Scientific Method
    • Labs
    • Veterinary Science
      • Canine
      • Feline
      • Introduction to Veterinary Science
      • Terminology
  • Resources
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  • Copyright and Privacy Policy