The ideal gas law - Safety air bag
 Question: Scientific Background:The simple gas laws describe the relationships involving the pressure, volume, temperature, and amount of an ideal gas.  Boyle’s law states that for a fixed amount of gas at a constant temperature, the gas volume is inversely proportional to the gas pressure.  V ∝ (1/P)Avogadro’s law states that the volume of a gas is proportional to the amount of the gas (at constant temperature and pressure. V ∝ nCharles law (also called Charles-Gay Lussac’s law) states that the volume of a fixed amount of gas at constant pressure is directly proportional to its temperature (in Kelvin). V ∝ TThe combination of these three laws is: V ∝ (nT)/PThis law can be rearranged to: PV ∝ nTThe proportional relationship can be written as equation: PV=nRT , where R is a proportional constant termed the gas constant.  The value of R (in SI unit) is:  R=8.3145 J mol-1  K-1SimulationHere is a simulation that simulates gas behavior Safety air bags One well known characteristic of gases in that the expand to fill their containers and assume the shape of their containers.  A practical application of these characteristics is the reaction that forms N2 (g) in an automobile air-bag safety system. This reaction utilizes the rapid decomposition of sodium azide. 2NaN3(s) à Na(l) + 3N2(g) The essential components of the system are a pellet containing sodium azide and an ignition device. When activated, the system inflates an air bag in a very short time (milliseconds range).  Note: the liquid sodium is converted to harmless solid sodium due to special additives that are also present initially. Picture credit:http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/airbag1.htmQuestion:Which statement regarding the above chemical reaction is true:
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 The temperature of the inflated bag is determined by the amount of sodium azide initially present.
 The pressure of the inflated bag is determined by the amount of sodium azide initially present.
 The volume of the inflated bag is 1.5 times larger than the volume of the uninflated one, since the mole ratio between and is 3/2.
 The pressure of the inflated bag is 1.5 times larger than the volume of the uninflated one, since the mole ratio between and is 3/2.

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Edited BY: Tali Lavy Edit Date: 2016-08-16 19:44:32
Edited BY: Tali Lavy Edit Date: 2016-08-16 19:34:23
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