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March 28, 2017

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enthalpy change^H is +23kJ mol-1 of phosphine (PH3) for the reaction
2P(s)red+3H2(g)---->2PH3(g)
a) Calc. entropy change for this reaction. Explain how this information allows you to determine the spontaneity or non-spontaneity of this reaction at any temp (S for PH3 is 210JK-1 mol-1)
b) do these results indicate anything about the possibility of the existence of phosphine? explain your answer.

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