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    Posted Aug 28, 2014, 8:12 AM by Eric Weiss
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1: Review: What is a mole?

Moles are the counting unit for chemistry. There are 6.022 x 1023 of something in one mole (be it atoms, molecules, elephants, whatever we’re talking about.)

Why is this number important? The mass of 1 mole of any element/compound is equal to its atomic mass in grams. This mass is called an element’s molar mass. Examples: 1 mole of H has a mass of 1.01 grams. 1 mole of Ne has a mass of 20.18 g. 1 mole of Kr has a mass of 83.798 g.

Video #1: Review: Converting Between Moles and Mass

Practice QuestionsUse Video #1 to help with these problems if need be.

1) If 1 mole of H has a mass of 1.01 g, how much does 5 moles of H weigh?

2) If the molar mass of H is 1.01 g and the molar mass of O is 16.00 g, what is the mass of the compound H2O?

3) What is the mass, in grams, of 2.3 moles of H2O?

4) How many moles are contained in 10 grams of xenon, Xe?

Answer Key: 1) 5.05 g; 2) 18.02 g; 3) 41.47 g; 4) 0.076 mol

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