Counting Atoms/The Mole

Vocabulary

100

What does amu stand for?

Atomic Mass Unit.

200

What is Avogadro's number?

6.02 x 10²³

300

Mass of 1 amu=?

1.66 x 10^-24g.

400

Scientists have defined this as a much smaller unit for mass.

AMU or atomic mass unit.

500

What is average atomic mass?

The average mass of all isotopes of an element.

Counting Atoms

100

2 moles of Li has this many atoms

1.2 x 10²⁴ atoms

200

2 moles of Li has a mass of 

14 g

300

What is the average atomic mass for O?

16.00 amu.

400

Calculate the mass of a sample of Copper that contains 25 atoms.

2.6x10^-21 g

500

Calculate the number of lithium atoms that are present in a sample that has a mass of 315 g.

2.7x10²⁵ atoms

The Mole

100

True or False. One mole of something consists of 1.66 x 10^-24 units of that substance.

False. One mole=6.022 x 10²³.

200

True or False. Atoms and Moles are the same thing.

False.

300

What is this called? 1 mol Cl= 35.45 g Cl.

Molar Mass

400

True or False. The mass of 1 mol of an element is equal to its average atomic mass in grams.

True.

500

When converting moles to atoms what mathematical operation do we use

multiply by N_A

Mole Calculations

100

How many moles are in 15. 0 g of N?

1.071 moles.

200

How many grams does 27 moles of O weigh?

432 g.

300

How many moles are in 35.24g of calcium?

0.9 mol Ca.

400

How many grams does 173 moles of boron weigh?

1,870 g.

500

In 78.20 g of potassium, there are ________ potassium atoms present.

1.204 x10²⁴ atoms.

Potpourri

100

What was the score of the ELCA Football game last Friday

55-3

200

What are the school colors for Michigan State

green & white

300

What is the mascot for Michigan State

Spartans

400

What school sits in "the prettiest little village on the plains"

Auburn

500

What was the name of the Braves Indian mascot

Chief Knockahoma