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Moles

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by

Mark Ward

on 15 November 2012

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Transcript of Moles

What is a Mole? How do we use it? How do we use it? Moles It’s not so easy when I have a strange amount ...

What if I had 10g of water ..........? What is a mole? Learning Outcomes: D - Recall how to calculate relative formula mass. B - Be able to convert between moles and mass for any given example. C - Explain what a mole is and calculate a mole of a compound in grams Dozen Gross Score Pair Million Hundred Starter Discuss in your pairs what these words mean? Mole 23 6 x 10 Just a number... 1 mole of atoms = relative formula mass in grams 8 O 16 What is the mass of 1 mole of oxygen atoms? The relative atomic mass of oxygen is 16 1 mole of atoms = relative formula mass in grams What would be the mass of a mole of oxygen MOLECULES? The mass of one mole of oxygen atoms is 16g H O 2 What is the mass of 1 mole of water molecules? The relative formula mass is 1+1+16 = 18 1 mole of molecules = relative formula mass in grams The mass of one mole of water molecules is 18g It is too small. 1. Why can’t we use the mass of a single atom in calculations? AQA Science © Nelson Thornes Ltd 2006  * 6 6 2. What is the relative atomic mass of one atom of carbon (12C)? AQA Science © Nelson Thornes Ltd 2006  * R 3. What is the symbol for Relative Atomic Mass? AQA Science © Nelson Thornes Ltd 2006  * It increases. 4. When an atom loses or gains an electron to make an ion, what happens to its Ar? AQA Science © Nelson Thornes Ltd 2006  * The Relative Compound Mass. 5. In compounds, we add the Relative Atomic Masses to get … AQA Science © Nelson Thornes Ltd 2006  * Mole. 7. What is the term for Relative Atomic Mass expressed in grams? AQA Science © Nelson Thornes Ltd 2006  * MAT 6. What is the symbol for Relative Formula Mass? AQA Science © Nelson Thornes Ltd 2006  * C B A It is always the same. It is too big. C B A 12 10 C B A ARM A a r C B A It stays the same. It decreases. C B A The Relative Formula Mass. The Relative Total Mass. C B A M F r r C B A Pole. Vole. 6 x 10 8. What is Avogadro's number? AQA Science © Nelson Thornes Ltd 2006  * C B A 6 x 10 5 x 10 30 12 23 Task Worksheet - work out the masses of a mole. H C 9
19 1
1 6
12 8
16 12
24 11
23 F Na Mg O Water If one mole of water is 18 grams What would happen if I had 1.8 g of water –
how many moles would that be? 0.1 moles If I had 180g of water – how many moles would that be? 10 moles H O 2 0.55 moles = 18 10 = Relative formula mass Mass of sample = The number
of moles So... the number of moles in 10g of water: The Number of Moles Relative formula mass x Number of moles Mass of sample = Finding the mass So if I had 2.5 moles of ammonia...
what mass of would I have? 3 NH The relative formula mass for ammonia is 14+1+1+1=17 Task Worksheet - work out the masses of a mole. H K 20
40 1
1 19
39 8
16 12
24 11
23 Ca Na Mg O M = 40 moles = 0.25 r M = 56 moles = 0.1 r M = 18 moles = 0.2 r M = 40 moles = 0.005 r M = 56 moles = 0.05 r Mass = 20g Mass = 5.6g Mass = 3.6g Mass = 60g Mass = 42g 12 16 24 12 g 16 g 24 g H 2 O 2 CO 1 + 1 + 16 = 18 12 + 16 + 16 = 44 40 + 16 = 56 18 g 44 g 56 g 1 mole of H atoms (H)
1 mole of H molecules (H )
1 mole of NaOH, 3 moles of NaOH
4 moles of H SO
How many moles in....
44g of CO , 22g of CO , 4.4g of CO
36g of H O, 18g of H O, 180g of H O
98g of H SO 4 2 2 2 2 2 2 2 4 2 2 = 42.5 grams Mass of sample = 2.5 x 17
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