Module 5 - Lesson 4 - Mastery check (must do)

What is the mole?

• A measurement of how many atoms are in a substance

• A cute furry creature that burrows in the ground

• A way of counting particles in groups of 6 x 10²³ atoms/molecules

• A way of weighing out atoms

what is the Avogadro constant?

• The idea proposed by Mr Avogadro that atoms were really small

• The Idea proposed by Mr Avogadro that if you have the same volume of any gas at RTP you will have the same number of particles

• Nobody cares about Mr Avogadro because he was a physicist!

• The idea proposed by Mr Avogadro that the same volume of any substance will contain equal numbers of particles

What has more atoms, A mole of Oxygen or a mole of Carbon?

• A mole of Oxygen

• A Mole of Carbon

• They both have exactly the same amount

what is the mass of 1 mole of Lithium?

• 7g

• 14g

• 3g

• 12g

What is the mass of 0.1 moles Sodium Bromide (NaBr)?

• 100.3g

• 10.3g

• 4.6g

• 103g

What is the mass of 0.4 moles of hydrated copper (II) sulfate crystals (CUSO₄.5H₂O)

• 74.4g

• 1.0g

• 100g

• 28.4g

How many moles are there in a 100g sample of magnesium sulfate (MgSO₄)?

• 0.833 moles

• 1.2 moles

• 1.66 moles

• 0.564 moles

How many moles are there is a 50g sample of Calcium Iodide (CaI₂)

If I asked you to bring me 3 moles of sulfur how much would you need to weigh out? - don't forget your units

How many moles are there in 60g of Sodium Hydroxide?