Watch this video for a worked example of how to calculate molar mass and number of moles. "The molar mass of a substance is the mass in grams of 1 mole of the substance. As shown in this video, we can obtain a substance's molar mass by summing the molar masses of its component atoms. We can then use the calculated molar mass to convert between mass and number of moles of the substance."
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License.