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Name STOICHIOMETRY INVESTIGATION II PRE LAB ACTIVITIES QUESTIONS Instructions Complete the following pre lab activities questions before coming to lab The instructor will check the pages for completion at the beginning of the lab 1 I have read the Introduction to the experiment and provided my answers to all embedded questions in the spaces provided in the Introduction 2 There is no video prelab for this experiment 3 Sodium azide NaN3 decomposes according to the following equation 2 NaN3 s 2Na s 3N2 g a How many grams of sodium azide are needed to produce 35 0 grams of nitrogen gas b How many grams of sodium will be produced from the above reaction Revised 10 17 10 Chemistry 40 Fall 2010 Page 1 of 9 STOICHIOMETRY INVESTIGATION II OBJECTIVE The objective of this guided open ended experiment is to work collaboratively in groups to design and perform a gas producing reaction inside a Ziplock to simulate an air bag reaction in order to inflate the Ziplock bag to its maximum capacity INTRODUCTION Air bags in automobiles contain solid sodium azide NaN3 that undergoes a very rapid decomposition reaction under very specific conditions producing a large amount of gas in a very short period of time The main chemical reaction that occurs inside an airbag is shown by the following equation 2 NaN3 s 2Na s 3N2 g The nitrogen gas produced in this reaction inflates the air bag very quickly and blocks the person from hitting the windshield in the event of an accident The mass of sodium azide in the air bag depends on the volume of nitrogen gas required to inflate the air bag at a specific temperature and pressure The correct amount of the reactant is placed inside the airbag and under the right condition the reaction occurs producing the required volume of nitrogen gas to fully inflate the air bag The chemistry and physics of airbags is more complex but for our purposes the simplified version given above will suffice In this experiment we will perform a different gas producing



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