Engineering a Better Airbag
Katie Letson
12/2/2022
LL
CAROLINA
1
Data
Data Table 1: Model Air Bag
Activity
Data and Calculations
Volume of 6 x 9 inch bag Room temperature (in K)
1.20 L
295.372 kelvins
29.87in x 25.4mm/1.00inches x1.00atm/760.mm= 0.998 atm n=PV/RT n=0.998atm*1.2 L/(0.0821 L- atm/mole-K)*295.372kelvins =1.1976/24.2500412 n= 0.0494 = 0.05 rounded up/ mol of c02
Room pressure (in atm)
Moles of co, reguired to inflate bag at room temperature and pressure
Balanced equation for the reaction of NaHCO3 and CH3COOH
NaHCO3(s) + CH3 COOH(aq) Hz O(I) + COz(g) + CH3 COONa(aq)
4.2g NaHCO3 0.0494moles x 84.0g= 4.2g (0.05molCO02*molar ratio CH3COOH/CO2)/ 0.833 mol (0.05molCO2)/0.833mol/L x 1000 ml/L=60.02mL
Mass of NaHCO3 needed for the reaction
Volume of vinegar required (0.833 M acetic acid)
Data Table 2: Model Air Bag
NaHCO3 Trial # (grams)
Vinegar (mL) 60.02m L 65.02m 7 75.02m
Observations
4.2g
Started to foam up Slow but bag was half blown up. This took about 17 seconds for reaction A lot of foam more inflated than trial 1
1
4.5g
2
3
5.0g
This reaction was almost instant ana
2016 Carolina Biological Supply Company
2
filled the bag quickly. It felt like it was going to burst open.
2016 Carolina Biological Supply Compa