The Mole

Question 1

How can amount of substance be measured?

Answer 1

Amount of substance can be measured using a unit called the mole (mol for short)

Question 2

How many particles does 1 mole contain?

Answer 2

6.02 x 10^23 particles - this number is known as Avogadro’s constant

Question 3

You can use Avogadro’s constant to convert between what?

Answer 3

Number of particles and number of moles

Question 4

Write an equation for using Avogadro’s constant to convert between number of particles and number of moles

Answer 4

Number of particles = number of moles x Avogadro’s constant

Question 5

What does 1 mole of any substance have a mass of?

Answer 5

1 mole of any substance has a mass that’s the same as its relative molecular mass (Mr) in grams

Question 6

What is the formula for working out number of moles?

Answer 6

Number of moles = mass of substance / Mr

Question 7

What is the concentration of a solution?

Answer 7

The concentration of a solution is how many moles are dissolved per 1dm3

Question 8

What are the units of concentration?

Answer 8

mol dm-3

Question 9

How do you work out number of moles using concentration?

Answer 9

Number of moles = concentration x volume

Question 10

What is the ideal gas equation?

Answer 10

The ideal gas equation lets you find the number of moles in a certain volume of gas

Question 11

What is the equation for the ideal gas equation?

Answer 11

pV = nRT … where,

p = pressure (Pa)
v = volume (m3)
n = number of moles
R = 8.31 J K-1 mol-1
T = temperature (K)