Grade 11 CBC/CBE Chemistry: Mass to Moles and Back with the Triangle Trick

A 5.3 kg bag of soda ash: how many moles does it hold? In this Grade 11 CBC/CBE Chemistry lesson you will learn where n = m ÷ M comes from and use it both ways, from grams to moles and from moles back to grams. You will use units to check your working, change kilograms, tonnes, milligrams and liquid volumes into grams first, and work backwards from a mass and an amount to find a molar mass and name a substance. Each idea comes with worked examples and questions you try yourself. FREE REVISION PAPER FOR THIS LESSON Paper 1: Core concepts Download it here: https://drive.google.com/file/d/1YaEg... IN THIS LESSON 0:00 Hook and title 0:31 In this video 1:24 Packets of sugar 2:05 Mole packets of acid 2:31 Turning it round 3:16 Let the units check you 4:08 The triangle, with understanding 4:56 Worked example 1: mass to moles 5:36 Worked example 2: moles to mass 6:19 Same mass, different numbers 6:51 Same mass, different moles 7:36 Your turn: hydrogen or oxygen? 8:27 Change to grams first 9:05 Worked example 3: the soda ash bag 9:54 Liquids: from volume to mass 10:41 Worked example 4: ethanol 11:38 Your turn: both ways 12:49 Working backwards 13:52 Your turn: which metal? 14:30 Find the mistake 15:39 Watch out for these mistakes 16:35 What to remember 17:20 Challenge and next video YOUR CHALLENGE A 13 kg cooking gas cylinder is filled with gas. If the gas were pure butane, C₄H₁₀, how many moles of butane would it hold? (C = 12, H = 1) Write your answer in the comments. PREVIOUS LESSON Lesson 3: Relative formula mass and molar mass:    • Grade 11 CBC/CBE Chemistry: Relative Formu...   NEXT LESSON Lesson 5: Counting atoms, molecules and ions. How many water molecules are in a glass of water, and how many atoms is that? ABOUT SP-SciLearn SP-SciLearn makes paced, interactive science math lessons for Kenyan learners following the CBC/CBE curriculum. Every lesson stops so that you can try a question yourself before the answer appears. Subscribe and turn on notifications so that you do not miss the next lesson. Grade 11 CBC/CBE Chemistry · 1.1 The Mole #Grade11Chemistry #CBEKenya #Chemistry