3.1 The Mole & Molar Mass

Question 1

What is a mole?

Answer 1

It is a unit, like a “ dozen” but much bigger

Question 2

1 mole=

Answer 2

6.022 x 10 to the 23

Question 3

What is Avogrado’s number?

Answer 3

• the number of particles in one mole

Question 4

What is Avogrado’s numbers equation?

Answer 4

N little A= 6.022 x 10 to the 23 particles per mole

Question 5

For Avogrado’s number the particles can be…

Answer 5

• atoms (for elements)
• molecules (for compounds)
• formula units (for ionic compounds)

Question 6

How much mass does a mole have?

Answer 6

It depends on the substance and how heavy the particles are

Question 7

What is molar mass?

Answer 7

-M or MM
- this is the mass of one mole
- the unit is g/mol

Question 8

How can you determine the mass of the mole?

Answer 8

• use the periodic table
• each element has an atomic mass, it is based on the number of particles in 12 g of carbon-12

Question 9

How can you determine the mass of the mole for compounds?

Answer 9

• You need to calculate molar mass
• Add the atomic masses for each atom in the molecule

Question 10

When converting between moles and masses, what is the equation?

Answer 10

n=m divided by M

Question 11

When converting between moles and masses, what does n represent?

Answer 11

The number of moles (mol)

Question 12

When converting between moles and masses, what does m represent?

Answer 12

The mass of the substance (g)

Question 13

When converting between moles and masses, what does M represent?

Answer 13

The molar mass (g/mol)