A) Based on the phase diagram of CO2 shown in the figure, describe the phase cha

Question

A) Based on the phase diagram of CO2 shown in the figure, describe the phase changes that occur when the temperature of CO2 is increased from 190 K to 350 K at a constant pressure of 1 atm

B) Describe the phase changes that occur when the temperature of CO2 is increased from 190 K to 350 K at a constant pressure of 5.1 atm.

C) Describe the phase changes that occur when the temperature of CO2 is increased from 190 K to 350 K at a constant pressure of 10 atm.

D) Describe the phase changes that occur when the temperature of CO2 is increased from 190 K to 350 K at a constant pressure of 100 atm.

Explanation / Answer

1)

At 190 K and constant 1 atm pressure, CO2 is in solid phase from diagram when we increase thhe temperature at constant pressure at 1 atm solid phase of CO2 is move toward to gas phase. at 194.5 K there is sublimation deposition so at this temperature the CO2 is in both solid and gas phase. further we increases temperature the gas phase of CO2 start. at 350 K CO2 is in gas phase.

2)

At 190K and 5.1 atm pressure CO2 in solid phase from diagram. when we increase the temperature the solid phase start to disappear and gas phase appear. at 216.3 K and 5.1 atm constant pressure CO2 on triple point. It means at 216.3 K temperature CO2 is in all three solid, gas and liquid phase. when we further increase the temperature the CO2 then in gas phase.

3)

At 190 K and 10 atm pressure CO2 is in solid phase. when we increase thhe temperature at constant pressure at 219 K CO2 on fusion point. at this temperature CO2 in both solid and liquid phase. firther increase in temperature CO2 go to into liquid phase.further increasein temperature it's on vaporization curve where CO2 in both liquid and gas phases. then further increase in temperature CO2 in gas phase.

4)

At 190 K and 100 atm pressure CO2 in solid phase. when we increase in temperature at constant pressure the solid goes toward to liquid phase by passing through fusion curve. after fusion curve CO2 is in liquid phase. at    304 K temperature liquid phase of CO2 is at critical condition at where when we increase the temperature CO2 is directly convert liquid phase to super critical fluid.

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