August 29th, 2011




Metal Canister
Several chunks of dry ice (3 lbm total) are put into a metal canister that is…?

Several chunks of dry ice (3 lbm total) are put into a metal canister that is initially empty. The
container is sealed and left on a hot Phoenix day (110 °F). After a long while, the
Bourdon gauge on the container reads 2850 psig.
Why is the pressure so high? How big is the container? Make the most accurate
calculation you can!

The dry ice has sublimated
(gone directly from a solid to a gas without passing through the liquid state)
you now have a can full of gaseous CO2

1 mole of an ideal gas occupies 22.4 liters at 0 degrees C and 14.7 psi
CO2 has a molecular weight of 44g per mole
3 lb mass = 1.36kg
1.36kg/44g = 30.91 moles of CO2
=22.4 *30.91 liters = 692.4 liters at 14.7 psi and 273K(0 deg C)
110 deg F = 316.33K (43.33 deg C)
gas law states PV = NRT

316.33/273*692.4 liters = 802.25 liters at 110deg F and 14.7 psi

14.7/2850 = 0.00516
802.5*.00516 = 4.14 liters is the volume of the can

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