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**Mass to Mass Stoichiometry**

g A grams of what you have mol A moles of what you have mol B moles of what you want g B grams of what you want Grams → Moles → Moles → Grams

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**Example #1 30 g CH4 → mol CH4 → mol H2O → g H2O grams of what you have**

moles of what you have mol H2O moles of what you want H2O g grams of what you want 30 g CH4 → mol CH4 → mol H2O → g H2O

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Example #1 CH4 + 2O2 → CO2 + 2H2O You have 30 g CH4 that you burn in oxygen. How many grams of water (H2O) can you make? 30 grams CH4 x 1 mole CH4 = moles CH4 16 grams 1.875 moles CH4 x 2 mole H2O = 3.75 moles H2O 1 mole CH4 3.75 moles H2O x 18 grams = 67.5 grams H2O 1 mole H2O

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**Percent Yield = actual x 100**

Percent yield is a comparison if the amount of product actually produced in a reaction versus the theoretical amount calculated. Percent Yield = actual x 100 theoretical When the reaction in example 1 was performed, only 52 grams of H2O were produced. Calculate the percent yield.

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**Baking Soda and Vinegar Volcano**

Congratulations on being ready to perform your experiment!

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Step 1 You will be given 5 g of vinegar (C2H4O2). Calculate how many grams of baking soda (NaHCO3) you need. C2H4O2 + NaHCO3 → CO2 + Na2CO3 + H2O The equation is already balanced!

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**C2H4O2 + NaHCO3 → CO2 + Na2CO3 + H2O**

Step 2 Calculate how many grams of water (H2O)you will make with your 5 g of vinegar (C2H4O2). C2H4O2 + NaHCO3 → CO2 + Na2CO3 + H2O The equation is already balanced!

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**Step 3 Measure out baking soda and vinegar; mix in beaker.**

Measure empty container. Filter out Na2CO3, so that water is in container. Measure mass of container and water to determine how much water you made.

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Percent Yield Calculate the percent yield of water produced by your reaction using the formula: Percent Yield = actual x 100 theoretical

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Stoichiometry: A calculation based on a balanced equation. Granada Hills Charter High School.

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