Step by Step Stoichiometry Practice Problems | How to Pass Chemistry

Check your understanding and truly master stoichiometry with these practice problems! In this video, we go over how to convert grams of one compound to grams of a completely different compound and learn how to convert grams to molecules. The more you practice the more you succeed in Chemistry!

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[melissamaribel]

READ THIS!!

Also here is the first question 0:43 broken down into individual parts.

So we are going from 48.64g H2O to grams of H2O2

Step 1: Convert gH2O to mol H2O
Using the molar mass of H2O as a conversion factor 1mol = 18.02 g
48.64 g H2O x (1 mol H2O/18.02 g H2O) = 2.6992 mol H2O

Step 2: Convert mol H2O to mol of H2O2
Using mol to mol ratio from balanced equation 2 mol H2O2=2 mol H2O

2.6992 mol H2O x (2 mol H2O2/2 mol H2O) =2.6992 mol H2O2

Step 3: Convert mol H2O2 to grams of H2O2
Using the molar mass of H2O2 as a conversion factor 1mol = 34.02 g

2.6992 mol H2O2 x (34.02 g H2O2/ mol H2O2) =91.83 g H2O2

If this isn't making sense then I recommend watching the previous videos that explain each conversion factor, once you understand what each conversion factor does then putting them altogether will make sense.

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