Explanation of how to find the molar mass of K2Cr2O7: Potassium dichromate.

A few things to consider when finding the molar mass for K2Cr2O7:

- make sure you have the correct chemical formula.
- always include the units for molecular weight (grams/mole).
- make sure you do the math right - follow the order of operations.
Watch: Molar Mass in Three Easy Steps: https://youtu.be/o3MMBO8WxjY

Note that molecular weight, molar mass, and gram formula mass are all the same thing.

Periodic Table Image from: https://commons.wikimedia.org/wiki/File:Periodic-table.jpg

Finding the Molar Mass (sometimes called Molecular Weight although the units are different) of a compound is a essential skill for the chemistry topic of stoichiometry and the first step in converting from moles to grams (or grams to moles).

For help with moles to grams conversions and more:

• More Moles to Grams Practice: https://youtu.be/aIv5nr8ZNyw
• Molar Mass in Three Easy Steps: https://youtu.be/o3MMBO8WxjY
• Understanding the Mole: https://youtu.be/DyLktMPTuHY
• Moles - Gram Conversions: https://youtu.be/aIv5nr8ZNyw
• How to Balance Chemical Equations: https://youtu.be/zmdxMlb88Fs
• Mole Ratio: https://youtu.be/i71BMVlrMiw
• Reaction Stoichiometry: https://youtu.be/rrTqOsZPpaU

For more chemistry help visit http://www.Breslyn.org .

Drawing/writing done in InkScape (https://www.InkScape.org). Screen capture done with Camtasia Studio 4.0. Created on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).