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Ch.11 - Liquids and Intermolecular Forces

Chapter 11, Problem 58

(b) Could you measure the triple point of water by measuring the temperature in a vessel in which water vapor, liquid water, and ice are in equilibrium under 1 atm of air? Explain.

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Hello everyone. So in this problem we're seeing if the provided statement is correct or not correct. So statement reads in the triple point of water, the solid phase liquid phase, labor phase and the air are in equilibrium at 1 80 M for pressure. So if we have this closed system, that should mean that there's going to be no transfer of matter in or out of the system because there's nowhere for the material to go. In that case, then there should be no air present in the system. If that's the case, then this means that our answer is incorrect or the state is incorrect because at the triple point then there should be no air present in the system that we're following. This little romantic here and that means that incorrect. It's just going to be the answer for this question. Thank you all so much for watching.
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You are high up in the mountains and boil water to make some tea. However, when you drink your tea, it is not as hot as it should be. You try again and again, but the water is just not hot enough to make a hot cup of tea. Which is the best explanation for this result? (a) High in the mountains, it is probably very dry, and so the water is rapidly evaporating from your cup and cooling it. (b) High in the mountains, it is probably very windy, and so the water is rapidly evaporating from your cup and cooling it. (c) High in the mountains, the air pressure is significantly less than 1 atm, so the boiling point of water is much lower than at sea level. (d) High in the mountains, the air pressure is significantly less than 1 atm, so the boiling point of water is much higher than at sea level.

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Appendix B lists the vapor pressure of water at various external pressures. (c) A city at an altitude of 5000 ft above sea level has a barometric pressure of 633 torr. To what temperature would you have to heat water to boil it in this city?

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