Two crystalline forms of white phosphorus are known. Both formscontain P 4 molec

ID: 680016 • Letter: T

Question

Two crystalline forms of white phosphorus are known. Both formscontain P4 molecules, but the molecules are packedtogether in different ways. The a formis always obtained when the liquid freezes. However, below -76.9°C, the a form spontaneouslyconverts to the b form.

Indicate which of the following statements are true or false,with regard to the above process.

P4(s, a) P4(s, b) Two crystalline forms of white phosphorus are known. Both formscontain P4 molecules, but the molecules are packedtogether in different ways. The a formis always obtained when the liquid freezes. However, below -76.9 degree C, the a form spontaneouslyconverts to the b form. P4(s, a) arrow P4(s, b) Indicate which of the following statements are true or false, with regard to the above process. At -76.9 degree C, ?G for this process is greater thanzero. At -76.9 degree C, the two solid phases cannot coexist. The sign of delta H for this process is positive. The alpha phase has the less ordered crystallinestructure. Below -76.9vC, the sign of delta G for this process ispositive. The sign of delta S for this process is negative.

Explanation / Answer

1)At -76.9°C, G for this process is greater thanzero.    ( false ) {Since at equilibriumposition G=0}
2)At -76.9°C, the two solid phases cannot coexist. ( false )    {Since at equilibriumtemp.,-form cann't changes to -form&it happensbelow -76.9 0 C;so the two forms coexists eachother}
3)The sign of H for this process is positive. ( false)   {For a spontaneous reaction to occur H must benegative}
4)The alpha phase has the less ordered crystallinestructure.       ( true ){ phase is always obtained when the liquid freezes,so it isless order& also entropy of the universe always increases}
5)Below -76.9°C, the sign of G for this process ispositive.     ( False )   {Below -76.9 0 C only the reaction is spontaneous&for aspontaneous reaction G is negative}
6)The sign of S for this process isnegative     ( true)      {always entropy of the universe isincreasing}

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Two crystalline forms of white phosphorus are known. Both forms contain P_4 mole

Two crystalline phases of white phosphorus are known. Both contain P4 molecules,

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Two crystalline forms of white phosphorus are known. Both formscontain P 4 molec

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