Learning Module 31: The Mole

The molar mass of propane is 44 grams per mole. How many moles is 11 grams of propane?

0.25

What is the molar mass of ammonia, NH3?

17 g/mole

Find a periodic table and look for the atomic mass of sodium, Na. What is it?

23 g/mole

When you weigh ammonia, what fraction of it is hydrogen?

3/17

The number of objects in a mole of something is dictated by which constant?

Avogadro's number.

Are you looking forward to explaining to your friends and family how many hydrogen atoms are in a can of soda?

Yes

Dr. Laude doesn't care for fancy definitions of a mole. He prefers the idea that a mole is:

an amount of a substance you can hold in your hand

What are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?

mass and number