Produced by the gas in trial 34 2ml of hydrogen

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produced by the gas. In trial 3/4, 2mL of hydrogen peroxide were used which resulted in a 17mL change in volume produced by the gas. In trial 5/6, 3mL of hydrogen peroxide was used which resulted in 22mL change in volume. In trial 7/8, 4mL of hydrogen peroxide were used and this yielded the most gas resulting in a 28mL change in volume. Conclusion: In this experiment, the experimenter acquired pure oxygen from the decomposition of hydrogen peroxide to form the oxygen gas. The use of a catalyst to speed up the reaction was used, the catalyst being yeast, catalysts are usually present in the form of an enzymes called catalase. The combination of hydrogen peroxide and yeast generated oxygen gas which flowed through the tube and into the graduated cylinder. Calculations were possible through the use of the ideal gas law, avogadros law, and the measurements of volume, pressure, and temperature.
1) Is it important to ensure the graduated cylinder is completely devoid of gas before starting a trial? Why or why not?
2) Would the volume of oxygen that's generated be affected if a smaller mass of yeast were used? Why or why not?
3) Identify some potential sources for the error in the experiment. Are any assumptions made that would add to the experimental error?

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