3. A 20,000 gallon tank is discovered buried below the land surface and has been

Question

3. A 20,000 gallon tank is discovered buried below the land surface and has been leaking slowly for many years. As the lead scientist you submerse a pressure feet the gauge 2 below liquid surface in the tank. The pressure gauge reads 114.8 lb/f2. What is the chemical liquid in the tank given that you have a chart of specific Gravity for different chemicals? G (Specific Gravity ) 0.69 Liquid chemical Benzoic sulfide hexanone Ethylbenzene Dichloromethane 0.92 1.65 1.46 Trichloroethene Sulfuric acid 1.10 Land Surface

Explanation / Answer

for a open container exposed to atmospehre we have ,

Ptotal = Patmosphere + Pfluid

but the container is closed from top so we can use the formula ,

the pressure measured can be defined as rho*g*h = 114.8 lb/ft2 = 0.05424766 atm = 5496.644 Pascals

g= accelearation due to gravity = 9.81 m/s2

h= 2 ft = 0.6096 m

so rho = 5496.644 Pascals/ ( 9.81 m/s2 *0.6096 m) = 919.14 kg/m3

density of water = 1000 kg/m3

so specific gravity = 919.14/1000 = 0.9191 = 0.92

the liquid is ethylbenzene

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