Balanced chemical equations involved in airbag deployment.
2NaN3 ---> 2Na + 3N2
10Na + 2KNO3---> K2O + 5Na2O + N2
K2O + Na2O + SiO2 --> Na2K2SiO4 (alkaline silicate glass)
10Na + 2KNO3---> K2O + 5Na2O + N2
K2O + Na2O + SiO2 --> Na2K2SiO4 (alkaline silicate glass)
REACTANTS PRODUCTS
NaN3 N2
KNO3 K2O
Na Na2O
Na2O N2
K2O Na2K2SiO4
SiO2
KNO3 K2O
Na Na2O
Na2O N2
K2O Na2K2SiO4
SiO2
Initial reactants and Final Products
Initial Reactants: SiO2, KNO3, NaN3
Final Products: N2, Na2K2SiO4
Final Products: N2, Na2K2SiO4
Chemicals needed to get airbag to deploy
NaN3
Na
N2
(Initial Reaction)
Na
N2
(Initial Reaction)
Number of grams of Na produced in the fist reaction.
PV = nRT 22.99 g of Na
Number of moles of N2 need to deploy airbag
PV=nRT= 3.378 moles of N2
(1.2 atm x 70L / .0821 x 303)
(1.2 atm x 70L / .0821 x 303)
What reactants are packed in the airbag module?
NaN3
Na
KNO3
K2O
Na2O
SiO2
Na
KNO3
K2O
Na2O
SiO2
Number of moles of NaN3 muust the module hold to inflate airbag?
PV=nRT = 19.25 moles of NaN3
Number of grams of KNO3 needed to completly react with sodium
PV=nRT = 3.82 g of KNO3
Safety of reactants/products
Safety of N2 ; converts NaN3 to harmless glass
Safety of NaN3; ability to
oxidize and fill an airbag rapidly
Safety of Na; produced when NaN3
decomposes making it less toxic
Safety pf K2O; helps push put the airbag then rapidly ( when mixed with other
compounds) change to alkaline silicate glass
Safety of Na2SiO4; allows the airbag to be safe and not injure as quickly due
to its harmlessness
Safety of NaN3; ability to
oxidize and fill an airbag rapidly
Safety of Na; produced when NaN3
decomposes making it less toxic
Safety pf K2O; helps push put the airbag then rapidly ( when mixed with other
compounds) change to alkaline silicate glass
Safety of Na2SiO4; allows the airbag to be safe and not injure as quickly due
to its harmlessness
Why stocichiometry and careful measurment of reactants is important in the chemistry and function of airbags?
Stoicheiometry and careful measurements of reactants are important because you
need the proper measurement in order for the reaction to act as you want it, the
reaction continuosly happens until one of the reactants run out. Mainly,
everything is based off the law of conservation of mass, which states that
matter can neither be created nor destroyed. When involving airbags, in order
for it to properly inflate, there has to be a specific set of measurements, so
that a reaction may be formed to cause inflation, but the inflation will decline
as the reactant becomes used up.
need the proper measurement in order for the reaction to act as you want it, the
reaction continuosly happens until one of the reactants run out. Mainly,
everything is based off the law of conservation of mass, which states that
matter can neither be created nor destroyed. When involving airbags, in order
for it to properly inflate, there has to be a specific set of measurements, so
that a reaction may be formed to cause inflation, but the inflation will decline
as the reactant becomes used up.
Complete Reaction
(1) 2 NaN3 → 2 Na + 3 N2 (g)
(2) 10 Na + 2 KNO3 → K2O + 5 Na2O + N2 (g)
(3) K2O + Na2O + SiO2---> Na2K2SiO4
(alkaline silicate glass)
(2) 10 Na + 2 KNO3 → K2O + 5 Na2O + N2 (g)
(3) K2O + Na2O + SiO2---> Na2K2SiO4
(alkaline silicate glass)