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The the following information to answer the next two questions.
Air bags are designed to deploy when a car moving in excess of undergoes a sudden decrease in speed. During deceleration. an electrical circuit ignites a small amount of explosive powder to cause scelium azide, , to react inside the air bag. The sodium oxide rapidly decomposes, producing nitrogen gas, which Fils the bag. The equation for this reaction is
 
 
 
Numerical Response
5. The amount of energy involved when 125g of decomposes is kJ/mol.
 
 
(Record your three-digit answer in the numerical-response section on the answer sheet.)
 
11. According to the reaction above, the molar enthalpy of formation of sodium azide is
A. +21.8 kJ/mol
B. +43.5 kJ/mol
C. -21.8 kJ/mol
D. -43.5 kJ/mol

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