convert 1 lb of co2 into cubic feet

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Request for Question Clarification by livioflores-ga on 21 Jun 2004 10:00 PDT

Hi!!

You need to know the pressure and temperature to find volume. With
weight you only can find the number of mols of CO2 that you have, with
pressure, temperature and # of mols you can easily find the volume,
without them you cannot.

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Clarification of Question by hchackenbush-ga on 21 Jun 2004 11:57 PDT

the co2 is in a tank with a regulator, but the pressure gauge is
broken.  assume the room temperature is 80`f.  my flow meter says .5
lb per 24 hours is being released.  i need to know the cubic feet that
.5 lb of co2 makes at room temp.  i hope this helps.
                                thank you,
                                barry

under the assumption that the temperature is at about -78 degrees
centigrade (where C02 is a liquid) the conversion would be
1 lbs [US, liquid] = 0.0167101 cubic foot

the co2 is in a tank with a regulator, but the pressure gauge is
broken.  assume the room temperature is 80`f.  my flow meter says .5
lb per 24 hours is being released.  i need to know the cubic feet that
.5 lb of co2 makes at room temp.  i hope this helps.
                                thank you,
                                barry

Given the following physical Properties of Carbon Dioxide
Molecular Weight:   44.01 lb/mol
Specific Volume at 70°F and 1 atm:  8.74 ft3/lb (0.42 m3/kg)
Specific Heat:  8.92 BTU/lbmol-deg F@ 70 deg. F
Specific Gravity:  1.555
Gas Density:   .1144 lb/ ft3 @ 70 deg. F. 14.7 PSIA
Psat @ 70 deg F:  852.8 psia
Liquid Density @ 70 deg F:  47.64 lb/ft3
Boiling Point:  Temperature:   -109.2 deg. F (-79 deg. C)
Critical Point: Temperature:  87.9 deg. F
                Pressure:    1070.6 PSIA
Triple Point :  Temperature:   -69.9 deg. F
                Pressure:    75.13 PSIA

we can state that at 80 degrees F and 1 atmosphere the volume would be
approximately 4.98 F3 for half a pound of liquid gas