Dr. Kent McCorkle, or "Dr. Kent' to his student, has helped thousands of students be successful in chemistry.

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[Download the accompanying PDF worksheet.] Perform the following calculations, being sure to give the answer with the correct number of significant digits. How many atoms are in 8.21 g Li? What is the mass in grams of 4.17×1021 formula units … Read More

[Watch the Lesson on Molar Mass here.] [Download the accompanying PDF worksheet.] Solve the following problems: What is the mass in grams of 51.2 moles of trichlorine nonafluoride? What is the mass in grams of 3.00 moles of magnesium chlorite? How … Read More

[View the accompanying Practice Problems on Molar Mass Conversions here.] What is Molar Mass? Molar mass is literally the mass of one mole of a substance. We saw in a previous lesson on atomic mass that the periodic table provides us … Read More