1C-3 : | Intensive Properties and the State of a System | 2 pts |
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Can pure liquid water exist at 99oC and 1 atm with a density of 0.980 g/cm3? Explain your reasoning. | |||||||||
Read: | Not much to say here. | ||||||||
Given: | T | 99 | oC | r | 0.98 | g/cm3 | |||
P | 1 | atm | |||||||
Find: | Can pure liquid water exist under these conditions? | ||||||||
Assumptions: | None. | ||||||||
Equations / Data / Solve: | |||||||||
Answers: | No. | ||||||||
The state of a pure substance that exists in a single phase is uniquely determined when 2 intensive properties are known. Here, the values of 3 intensive properties are specified. Any one of the three could be considered too much, extraneous or redundant information. For example, at the given T & P, the density of liquid water is 0.959 g/cm3, not 0.980 g/cm3. Similarly, liquid water at the given T & density exists at a pressure of about 0.471 atm, not 1 atm. | |||||||||