21. On the sunlit surface of Venus, the atmospheric pressure is 9.0 3 106Pa, and the temperature is 740 K. On the earth’s surface the atmosphericpressure is 1.0 3 105 Pa, while the surface temperature can reach 320 K.These data imply that Venus has a “thicker” atmosphere at its surfacethan does the earth, which means that the number of molecules per unitvolume (N/V) is greater on the surface of Venus than on the earth. Findthe ratio (N/V)Venus/(N/V)Earth.

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