The triple point of H2O is at 0.00603 atm and 0.01 degrees Celsius. A sample of H2O at -50 degrees Celsius is heated to 120 degrees Celsius at a constant temperature of 380 Torr. The change(s) of state occurring in this process is (are)?
Now, I know the answer is "solid to liquid to gas", but how do I know that? I'm going over the answers I got wrong on my previous test as a way to study for my exam tomorrow and this one is confusing me. The other options were "solid to gas to liquid", "liquid to gas" (the one I chose), "solid to gas", and "solid to liquid".
Thank you for your help in advance.
Now, I know the answer is "solid to liquid to gas", but how do I know that? I'm going over the answers I got wrong on my previous test as a way to study for my exam tomorrow and this one is confusing me. The other options were "solid to gas to liquid", "liquid to gas" (the one I chose), "solid to gas", and "solid to liquid".
Thank you for your help in advance.
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Well, you know that water at -50 oC is a solid (ice). So, this eliminates the answer choice:
"liquid to gas"
Remember that the transition from solid to gas requires a change (to be specific, a decrease) in pressure. Since you were told that P is constant, you can eliminate the answer choices: "solid to gas to liquid" and "solid to gas." And you are left with: "solid to liquid to gas"
This answer choice makes sense because if you look at a phase diagram, you will see that if you are in the solid region and you increase T at constant P, you will gradually go into the liquid and then the vapor region.
hope this helps!
"liquid to gas"
Remember that the transition from solid to gas requires a change (to be specific, a decrease) in pressure. Since you were told that P is constant, you can eliminate the answer choices: "solid to gas to liquid" and "solid to gas." And you are left with: "solid to liquid to gas"
This answer choice makes sense because if you look at a phase diagram, you will see that if you are in the solid region and you increase T at constant P, you will gradually go into the liquid and then the vapor region.
hope this helps!
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http://img851.imageshack.us/img851/5473/…
See this attached image for a phase diagram for water.
Pressure is constant, so all you're doing is moving left ---> right at a constant line.
mmHg is the same pressure as Torr. Just different names.
380 torr > .00603 atm, so you would be above the triple point moving from the solid, to liquid, to gas phases.
See this attached image for a phase diagram for water.
Pressure is constant, so all you're doing is moving left ---> right at a constant line.
mmHg is the same pressure as Torr. Just different names.
380 torr > .00603 atm, so you would be above the triple point moving from the solid, to liquid, to gas phases.