Presentation on theme: "Mass to Mass Stoichiometry"— Presentation transcript:
1 Mass to Mass Stoichiometry g Agrams of what you havemol Amoles of what you havemol Bmoles of what you wantg Bgrams of what you wantGrams → Moles → Moles → Grams
2 Example #1 30 g CH4 → mol CH4 → mol H2O → g H2O grams of what you have moles of what you havemol H2Omoles of what you wantH2Oggrams of what you want30 g CH4 → mol CH4 → mol H2O → g H2O
3 Example #1CH4 + 2O2 → CO2 + 2H2OYou 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 CH416 grams1.875 moles CH4 x 2 mole H2O = 3.75 moles H2O1 mole CH43.75 moles H2O x 18 grams = 67.5 grams H2O1 mole H2O
4 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 100theoreticalWhen the reaction in example 1 was performed, only 52 grams of H2O were produced. Calculate the percent yield.
5 Baking Soda and Vinegar Volcano Congratulations on being ready to perform your experiment!
6 Step 1You will be given 5 g of vinegar (C2H4O2). Calculate how many grams of baking soda (NaHCO3) you need.C2H4O2 + NaHCO3 → CO2 + Na2CO3 + H2OThe equation is already balanced!
7 C2H4O2 + NaHCO3 → CO2 + Na2CO3 + H2O Step 2Calculate how many grams of water (H2O)you will make with your 5 g of vinegar (C2H4O2).C2H4O2 + NaHCO3 → CO2 + Na2CO3 + H2OThe equation is already balanced!
8 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.
9 Percent YieldCalculate the percent yield of water produced by your reaction using the formula:Percent Yield = actual x 100theoretical