Reacting Mass, Percentage Yield & Atom Economy | A Level Chemistry Masterclass

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Reacting Mass, Limiting Reagent, Percentage Yield and Atom Economy | A Level Chemistry Masterclass

Description Introduction:
Hello everybody! In this A Level Chemistry video, we continue exploring the Amount of Substance topic. We’ll cover reacting mass calculations, identifying limiting and excess reagents, calculating percentage yield, and understanding atom economy. This video is suitable for all exam boards and is packed with examples to make these tricky concepts clear.

Timestamps:
0:00 – Introduction
0:07 – Mole ratios and equations
0:33 – Magnesium and hydrochloric acid example
1:33 – Propane combustion example
2:53 – Ammonia production example
4:51 – Reacting mass calculations explained
5:15 – Iron oxide and carbon monoxide example
9:24 – Lead nitrate and lead iodide example
12:31 – Limiting factor and excess explained
12:55 – Examples of limiting reagent calculations
17:27 – Understanding yield: actual vs theoretical
19:18 – Calculating percentage yield
20:18 – Reacting mass + percentage yield example
23:37 – Introduction to atom economy
24:50 – Importance of atom economy for environment and cost
27:00 – Calculating atom economy examples
30:12 – Choosing the best reaction: copper sulfate case study
32:55 – Summary and closing

Comprehensive Overview:
In this video, you’ll learn how to:

Use mole ratios to scale chemical reactions

Perform reacting mass calculations using the box/grid method

Identify the limiting reagent and excess reagent in reactions

Calculate theoretical, actual, and percentage yields

Understand and calculate atom economy

Analyse how atom economy impacts cost, sustainability, and environmental impact

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Correction:
At 16:00 the H2 moles should be 1.8 … and this means O2 is the limiting reagent. As a result of this 1 mole of water would be produced and the mass would be 18g