Understanding the Mole Concept and Avogadro's Number

What is a mole in chemistry?

• A small rodent

• A large number used to count atoms

• A secret agent

• A type of skin blemish

Avogadro's Number is approximately equal to:

• 6.02 x 10^23

• 10.00 x 10^23

• 12.00 x 10^23

• 1.00 x 10^23

What is the mass of 12 atomic mass units of carbon in grams?

• 12 grams

• 24 grams

• 1 gram

• 6 grams

How many grams of iron are in 1 mol?

• 22.99 grams

• 32 grams

• 79.904 grams

• 55.845 grams

Which of the following is true about molar mass?

• It is not found on the periodic table.

• It is always 12 grams.

• It is unique to each element.

• It is the same for all elements.

How many atoms are in 2 grams of carbon?

• 1 x 10^15

• 1 x 10^23

• 6 x 10^23

• 12 x 10^23

What is the first step in converting grams to atoms?

• Multiply by Avogadro's Number

• Divide by the molar mass

• Add the atomic number

• Subtract the atomic mass

In the given times ratio method, what is the purpose of setting up a ratio?

• To add units

• To cancel units

• To multiply units

• To divide units

How many atoms are in 0.67 mols of water?

• 2 x 10^23

• 6 x 10^23

• 1.2 x 10^24

• 3 x 10^23

What is the relationship between 1 mol of a substance and its molar mass?

• 1 mol is always 1 gram

• 1 mol is equal to the molar mass in grams

• 1 mol is equal to 12 grams

• 1 mol is equal to 6 grams