Presentation on theme: "Mass to Mass Stoichiometry"— Presentation transcript:
1Mass 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
2Example #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
3Example #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
4Percent 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.
5Baking Soda and Vinegar Volcano Congratulations on being ready to perform your experiment!
6Step 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!
7C2H4O2 + 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!
8Step 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.
9Percent YieldCalculate the percent yield of water produced by your reaction using the formula:Percent Yield = actual x 100theoretical