Chapter 9 - The Mole Concept

Question 1

What is Avogadro’s number/constant?

Answer 1

6.023 x 10²³

Question 2

Mole

Answer 2

A mole of a substance is the amount of that substance that contains 6.023 x 10²³ particles of that substance

Question 3

What is the mass of 3 moles of Al atoms? (Mr = 27)

Answer 3

1 mole of Al = 27g

3 moles of Al = 27g x 3 = 81g

Question 4

Relative molecular mass

Answer 4

(of a compound) is the average mass of one molecule of that compound compared with 1/12 of the mass of one atom of the carbon-12 isotope. Its symbol is Mr, but it has no units

Question 5

Standard Temperature and Pressure

Answer 5

Standard set of conditions for experimental measurements, to enable comparisons to be made between a set of data

Question 6

What is standard temperature?

Answer 6

273K or 0°C

Question 7

What is standard pressure?

Answer 7

1 x 10^5 Pa or 100kPa

Question 8

Molar volume

Answer 8

Volume occupied by one mole of a substance (chemical element or compound) at a given temperature and pressure

Question 9

What is the molar volume of an ideal gas at 100kPa (1 bar)?

Answer 9

22. 4 dm³/mol @ 0°C

24. 8 dm³/mol @ 25°C

Question 10

dm³ = ?

Answer 10

litres

Question 11

What is the final calculations table we use for moles?

Answer 11

ATOMS
÷↓no. atoms↑x
   PARTICLES
÷↓       L        ↑x
      MOLES
x↓      Mr       ↑÷
        MASS