126 Heterogeneous s PROBLEMS The Gibbs-Dalton e Gibbs-Dalton law implies that th

Question

126 Heterogeneous s PROBLEMS The Gibbs-Dalton e Gibbs-Dalton law implies that the partial pressure of va with a condensed phase of water is the same in a mixture with r r is the same in a mixture with dry aloriun vapor at equil would be were the water component in isolation. Because it correspond as t abundance of vapor at which no mass is transformed from one phaset the this vapor pressure describes the state at which air is saturated. her of 6.5 K km-1, representative of thermal structure in the troposphere calculate (a) the equilibrium vapor pressure as a function of altitude,an2 corresponding mixing ratio of water vapor as a function of altitude. the result to explain why water vapor is distinguished from other trace (Fig. 1.2) and (b) the c) Appy Fig. 1.23. 2. A more accurate version of (4.39) is given by logioPo =-29374-4.9283logoT+ 23.5471 (hPa). -2937.4 log, ' p Estimate the boiling temperature for water at the altitude of (a) Denver: 5000 (b) the North America continental divide: 14,000, (c) the summit of Mt. Everest 29,000. 3. Present-day Venus contains little water, which is thought to have been absorbed b its atmosphere and eventually destroyed during the planet's evolution (Sec. 8: (a) For present conditions, wherein Venus has a surface pressure of 9 x 10 at what surface temperature does water vapor become the atmosphere's prim constituent? Compare this with Venus' present surface temperature of 750 (b) Were these conditions to prevail to altitudes where energetic UV radiatio present, what would be the implication for the ahundance of unt

Explanation / Answer

Answer: Considering lapse rate -6.5 K /km, Temperatures at Denver, North America and Mt Everest are 277.094, 259.2632 and 229.5452 K respectively.  

We can calculate vapor pressure (Pw) using mentioned equation.

Boiling Temp Tb = (1/To - {Rln(P/Po)}/Hvap )-1 where R= 8.314 Jmol-1K-1, Po = atmospheric pressure at surface = 101325 Pa. Hvap = enthalpy for heat exchange = 40.65 KJ/mol, To= boiling temperature at surface,

hence, boiling tempatures are (in K)

100.0164739 100.0173134 100.0189775

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