Chemistry / Unit 3 Chem 0373 short lesson, about 20 seconds
Molar Mass
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The idea
A substance's molar mass is the mass in grams of one mole, numerically equal to its formula mass.
In practice
Carbon-12's atomic mass is exactly 12 amu, so one mole of carbon-12 atoms has a mass of 12 grams to within any laboratory precision.
Where people slip
Atomic mass and molar mass share a number, not a unit: one is amu, the other grams per mole.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Unlocks
- 0376Converting Mass to Moles
- 0391Determining Molecular Formula from Empirical Formula and Molar Mass
- 1259Gas Density from the Ideal Gas Law
- 1262Determining Molar Mass from Measured Gas Properties
- 1300Graham's Law of Effusion
- 1305Calculating Relative Effusion Rates
- 1321Calculating Root-Mean-Square Speed
- 1373Ranking Boiling Points by Dispersion-Force Strength
- 1558Calculating a Solution's Vapor Pressure Under Raoult's Law
- 1580Determining Molar Mass from a Colligative Property
- 1607Writing Relative Rate Expressions from a Balanced Equation
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