InterviewSolution
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InterviewSolution
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Measurements carried out by the Soviet "Venus" space-probes with the aid of their landing modules have shown that from an altitude of 50 km above the surface of Venus the temperature of the planet's atmosphere changes linearly as the altitude decreases. Using the data given below prove that this layer of the atmosphere consists mainly of carbon dioxide gas. {:("Altitude above surface h, km",50,42,37,15,0),("Pressure p,atm",1,3.3,6,37,90),("Temperature t,"^@C,80,160,200,360,485),("T,K",353,433,473,633,758):} |
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Answer» `M = (alpha RT_0 "log" (p_0//p))/(G "log" (T_0//T)) , "where" alpha = (T_0 - T)/(hT_0) = 1.05 xx 10^(-5) m^(-1)` Noting that for Venus `g = 8.52 m//s^2`. , we can obtain the values of the molar mass at four altitudes. The average value is `M_(av) = (40.0 + 43.2 + 44.4 + 46.0)/(4) = 43.4` kg/mole. The molar mass of `CO_2`is 44 kg/mole . This leads to the CONCLUSION that the atmosphere of Venus consists mainly of carbon dioxide gas. Other experimental methods corroborate this conclusion. |
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