Topic_8_Prelab_Fall2011

Topic_8_Prelab_Fall2011 - Topic 8 Fall 2011 Pre-Laboratory...

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Topic 8 Fall 2011 Pre-Laboratory Questions 1. To begin your experiment you will calibrate your apparatus by injecting air into a sealed reaction bottle. Suppose you inject 20.0 mL of air (initially at a temperature of 23.1ºC and a pressure of 0.954 atm) into a bottle at the same temperature and pressure. After the injection, the pressure is observed to be 1.023 atm (with no change in temperature). How many moles of gas caused this pressure change, 1.023-0.954 atm= 0.069 atm? This mole-to pressure change equivalence will be used as a conversion factor in questions #2 and 3 below. 2. You will be using 15. mL of 6.0% H 2 O 2 by mass (m/m). If you assume the density of the solution is 1.0 g/mL and that all of the hydrogen peroxide decomposes according to the reaction: 2 H 2 O 2 (aq) 2 H 2 O ( ) + O 2 (g) What is the total moles of oxygen gas that can be generated? If this oxygen is formed within the bottle described in question #1, what change in pressure would be predicted?
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