Question: Operation of an MHD converter requires an electrically conducting gas. It is proposed to use helium gas seeded with 1.0 mole percent cesium. The cesium

Operation of an MHD converter requires an electrically conducting gas. It is proposed to use helium gas “seeded” with 1.0 mole percent cesium. The cesium is partly ionized (Cs Cs` e) by heating the mixture to 1800 K, 1 MPa, in a nuclear reactor to provide free electrons. No helium is ionized in this process, so that the mixture entering the converter consists of He, Cs, Cs`, and e. Determine the mole fraction of electrons in the mixture at 1800 K, where ln K 1.402 for the cesium ionization reaction described.

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