Mass to Mass Stoichiometry

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Stoichiometry: Calculations with Chemical Formulas and Equations

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Presentation transcript:

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

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

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 = 1.875 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

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.

Baking Soda and Vinegar Volcano Congratulations on being ready to perform your experiment!

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!

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!

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.

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