Understanding Counting Words and the Mole Concept

What is the term used to describe a group of 12 items?

• Mole

• Ream

• Dozen

• Pair

In chemistry, what does the term 'mole' refer to?

• 500 sheets of paper

• 6.02 x 10^23 particles

• A dozen molecules

• A pair of atoms

What is Avogadro's Number used for in chemistry?

• Determining the volume of a liquid

• Measuring the mass of a substance

• Counting a large number of particles

• Counting pairs of shoes

Why is Avogadro's Number specifically 6.02 x 10^23?

• It is the number of ions in a mole of NaCl

• It is the number of molecules in a liter of water

• It is the number of atoms in 12 grams of Carbon-12

• It was randomly chosen

What is the molar mass of water (H2O) rounded to one decimal place?

• 16.0 g/mol

• 18.0 g/mol

• 22.4 g/mol

• 20.0 g/mol

How many molecules are in 400 grams of water?

• 1.3 x 10^25

• 6.02 x 10^23

• 2.0 x 10^24

• 5.4 x 10^21

At STP, what is the volume of one mole of any gas?

• 22.4 L

• 18.0 L

• 24.0 L

• 20.0 L

How many atoms are in 200 mL of neon gas at STP?

• 5.4 x 10^21

• 1.3 x 10^25

• 6.02 x 10^23

• 2.0 x 10^24

What is the molar mass of Neon used in the conversion example?

• 18.0 g/mol

• 24.0 g/mol

• 20.18 g/mol

• 22.4 g/mol

Which conversion factor is used to go from the volume of a gas to moles at STP?

• 22.4 L/mol

• Avogadro's Number

• Molar Mass

• 1000 mL/L