![]() Na 1 x 22.99 = 22.99 Cl 1 x 35.45 = 35.45 58.44 g/mol Mass A – Mass B Ex: Determine the mass of NaCl that decomposes to yield 355 g Cl2 2NaCl 2 Na + Cl2 1 mol Cl2 2 mol NaCl 58.44 g NaCl 355 g Cl2 x _ x _ x _ = 70.90 g Cl2 1 mol Cl2 1 mol NaCl Cl 2 x 35.45 = 70.90 g/mol 585 g NaCl 1 amu = 1.66x10-24 g We can add these mole relationships on either end of the mole ratio: # unit A x 1 mol A x mol B x _ unit B = # unit B _ unit A _ mol A 1 mol B mole relationship mole ratio mole relationship (switch units) (switch substances) (switch units) *A is the GIVEN substance & B is the WANTED substance.1 mol = 6.02 x 1023 atoms / molecules / particles.What other relationships do we have for the mole? mol CO2 1 mol O2 x _ 5.0 mol O2 = 2 mol CO2 ![]() CO(g) + 2H2(g) CH3OH(l) 1 mol CO = 2 mol H2 = 1 mol CH3OH Ex: How many moles of O2 are required to produce 10. Stoichiometry Stoichiometry – Study of quantitative relationships that can be derived from chemical formulas and chemical equations Mole ─ Mole Relationship need a balanced equation Mole Ratio – the ratio of moles of one substance to moles of another substance in a balanced chemical equation The coefficients in a balanced equation give the relative numbers of molecules, as well as, the relative number of moles. Regardless of whether you were successful, state what you've learned from your experiment, and note which of your predictions for the experiment's results were true.Stoichiometry – Chemical Quantities Notes If not, provide a possible explanation for why your experiment was unable to answer these questions, and suggest a method that could be used in another experiment to better answer them. State whether the results of your experiment allowed you to answer the questions that you set out in the introduction. State Whether Your Experiment Succeededįinally, in your conclusion, examine the data based on your goals and predictions for the experiment. ![]() Also report any possible sources of error in your data and your analysis. Explain any trends in your data, and note whether any irregularities in the results brought up further questions. Your conclusion should also provide a brief explanation of what the final data from your experiment indicates. For instance, if analyzing the data from an experiment to determine the density of formaldehyde produced an average result of 8.12 x 10^2kg/m^3, you would include only this result, and not any individual measurements from the experiment. Your conclusion should not restate all the data from your experiment, only note any final data you've determined from analysis. The heart of your lab report focuses on the data from your experiments - including all the data you obtained along with a detailed analysis of that data. In addition to the summary of methods, include a brief explanation of why you chose those methods to obtain your data. Note the important tools and substances in your experiment, and any methods used to obtain data. This should not be a comprehensive list of all items used in the experiment the full list should be included in the "methods" section of your lab report. Provide a brief summary of the methods you used in your experiment.
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