Molecular Mass: Definition, Formula & Calculation


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The atomic mass of hydrogen is approximately 1.0079 amu. The atomic mass of an oxygen atom is approximately 15.9994 amu. What is the molecular mass of water?

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1. Molecular mass is measured in _____.

2. The atomic mass of a carbon atom is approximately 12.011 amu. The atomic mass of an oxygen atom is approximately 15.9994 amu. What is the molar mass of carbon dioxide (CO2)?

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About This Quiz & Worksheet

This quiz and worksheet will help you determine your level of understanding when it comes to molecular mass. Quiz questions will focus on identifying the molecular or formula mass of various compounds.

Quiz & Worksheet Goals

This quiz will ask you to identify compounds based on a given mass and determine the mass of compounds, such as:

  • Water
  • Carbon dioxide
  • Zinc chloride

Skills Practiced

  • Problem solving - use acquired knowledge to determine the molecular mass or formula mass of a compound
  • Information recall - access the knowledge you've gained on how to calculate molecular mass
  • Knowledge application - use your knowledge to identify unknown compounds based on a given mass

Additional Learning

To read more about molecular mass, see the related lesson called Molecular Mass: Definition, Formula & Calculation. This lesson covers the following topics:

  • Formula weight
  • Formula mass
  • Determining molecular and molar mass