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When the humidity is 25$\%$ and the temperature is $30^{\circ} \mathrm{C},$ what is the water vapordensity?

about 0.425 mol per 1000 $\mathrm{L}$

Chemistry 101

Chapter 12

Concentrating Matter

Section 4

Humidity, Condensation

Intro to Chemistry

Atoms, Molecules and Ions

Carleton College

Rice University

University of Toronto

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question Number seven is a relative humidity question. It also requires us to use this graph that shows the water density in moles per 1000 liters as a function of temperature. Same graph we've been using here for a lot of the previous problems. Look something like this, and we're working with 30 degrees Celsius and at 30 degrees Celsius, it appears from the graph that we are about 1.7 or so moles per 1000 liters. That is maximum. If we are at a relative density of 25% than the actual humidity or water vapor density is going to be 25% of that. So 25% of 1.7 is 0.43 about moles per 1000 leaders.

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