The Soviet Venera VII probe, which reached Venus on December 15, 1970, found the following conditions on the planet surface: 

Interferometric measurements indicate that there is only a 10 to 20 K temperature variation across the planet, and that the coldest region lies at the equator. Radar astronomy measurements suggest that the dielectric constant of the Venus surface is typical of mineral silicates. Furthermore, from spectroscopic observations it has been concluded that the approximate atmospheric composition of Venus is 

Since the temperature of Venus is so high, and the planet is quite old, it may be assumed that all chemical reactions occurring between the atmosphere and the surface minerals are in chemical equilibrium. 

The following reactions are thought to occur:

Determine whether the chemical equilibrium assumption is consistent with the reported data. Data: For FeO·SiO₂, Δ_fG° = −1.060 MJ/mol and Δ_fH° = −1.144 MJ/mol; other Gibbs energy of formation data are given in Appendix A.IV and the Chemical Engineers’ Handbook.13 The heat capacity of the solid species is /cr

Since the temperature is so high, you may assume that the gas phase is ideal. 

Transcribed Image Text:

T 747 20 K P 90 15 (earth) atmospheres