Name: _________________________________ flip-chart guy on stoichiometry A list of common stoichiometry problems: (ratio) Moles to moles (simple - one step) (division) (multiplication) Grams to moles moles to grams Particles to moles moles to particles Liters to moles moles to liters Energy to moles moles to Energy (complex- many steps) Grams to moles to moles to grams liters to moles to moles to liters Grams to moles to moles to particles liters to moles to moles to particles Grams to moles to moles to liters liters to moles to moles to grams Grams to moles to energy liters to moles to energy particles to moles to moles to particles particles to moles to moles to grams particles to moles to moles to liters particles to moles to energy Name: _________________________________ flip-chart guy on stoichiometry Details of how to solve problems: Is the equation set up and balanced? No, then do it. Yes, then Start at the left and identify what the problem has given. Then go to the right and find the wanted. Set up the problem. Do the calculations. GIVEN is it in? 1. grams 2.grams 3.grams 4.particles 5.particles 6.particles 7.liters 8.liters 9.liters DIVIDE by molar mass by molar mass by molar mass by Avogadro’s # by Avogadro’s # by Avogadro’s # by 22.4 liters per mole by 22.4 liters per mole by 22.4 liters per mole MOLES (given) to get moles to get moles to get moles to get moles to get moles to get moles to get moles to get moles to get moles use RATIO (wanted/given) convert given moles to wanted moles convert given moles to wanted moles convert given moles to wanted moles convert given moles to wanted moles convert given moles to wanted moles convert given moles to wanted moles convert given moles to wanted moles convert given moles to wanted moles convert given moles to wanted moles MOLES (wanted) moles moles moles moles moles moles moles moles moles MULTIPLYING moles (w) by molar mass by Avogadro’s # by 22.4 liters per mole by Avogadro’s # by molar mass by 22.4 liters per mole by 22.4 liters per mole by Avogadro’s # by molar mass To get WANTED grams particles liters particles grams liters liters particles grams Name: _________________________________ flip-chart guy on stoichiometry 5 H2O2 + 2 KMnO4 + 3 H2SO4 → 2 MnSO4 + 1 K2SO4 + 8 H2O + 5 O2 + 418 KJ 1. How many liters of oxygen gas at STP can be produced from 4.92 grams of H2SO4? 2. How many grams of H2O2 are required to produce 8.2 x 1022 molecules of water? 3. How many KJ of Energy are released if 43.7 grams of H2SO4 are consumed? 4. How many molecules of H2O2 must be consumed to release 655 KJ of Energy? 5. How many molecules of O2 are produced if 3.9 x 10 24 molecules of H2SO4 are produced? Name: _________________________________ flip-chart guy on stoichiometry 5 H2O2 + 2 KMnO4 + 3 H2SO4 → 2 MnSO4 + 1 K2SO4 + 8 H2O + 5 O2 + 418 KJ 6. How many liters of O2 at STP must be produced in order to produce 9.26 grams of K2SO4? 1 N2 + 3 H2 → 2 NH3 7. How many liters of NH3 gas at STP can be produced if 8.16 liters of H2 gas are consumed? 8. If you have 12 grams of N2 and 3 grams of H2, which is the limiting reactant? (not flip-chart guy)