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Die Bildungsenthalpie von SnJ4

The enthalpy of formation ofSnI 4

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Abstract

The changes of enthalpy for the reactions

  1. (1)

    Sn(c)+2I2(c)+4165 CS2(l)=[SnI4; 4165 CS2] (sol.),

  2. (2)

    SnI4(c)+4223 CS2(l)=[SnI4; 4223 CS2] (sol.)

At 298,15 K have been found by solution calorimetry to be ΔH 1=(−46.7±0.3) and ΔH 2=(+3.2±0.1) kcal Mol−1, resp. Neglecting the heat of dilution which is approximately zero these values give ΔH f o (SnI4; c; 298 K)=9−49.9±0.4) kcal Mol−1 for the enthalpy of formation of SnI4.

From existing literature data the standard entropy is calculated to beS o(SnI4; c; 298 K)=69,7 cal Mol−1 K−1 giving ΔG f o (SnI4; c; 298 K)=−50,5 kcal Mol−1 for the corresponding change in theGibbs free energy.

Zusammenfassung

Die Enthalpieänderungen bei 298,15 K für die Reaktionen

  1. (1)

    Sn(c)+2 J2(c)+4165 CS2(l)=[SnJ4; 4165 CS2] (Lsg.)

  2. (2)

    SnJ4(c)+4223 CS2(l)=[SnJ4; 4223 CS2] (Lsg.)

Wurden kalorimetrisch bestimmt. Sie betragen ΔH 1=(−46,7±0,3) und ΔH 2=(+3,2±0,1) kcal Mol−1. Unter Vernachlässigung der Verdünnungswärme, welche angenähert Null ist, ergibt sich daraus die Bildungsenthalpie des SnJ4: ΔH f o (SnJ4; c; 298 K)=(−49,9±0,4) kcal Mol−1.

Aus den vorhandenen Literaturdaten berechnet man für die Standardentropie des SnJ4 S o (SnJ4; c; 298 K)=69,7 cal Mol−1 K−1, woraus ΔG f o (SnJ4; c; 298 K)=−50,5 kcal Mol−1 für die Freie Bildungsenthalpie folgt.

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  1. Institut für Anorganische Chemie der Universität Wien, Österreich

    J. Mikler

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  1. J. Mikler
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Mikler, J. Die Bildungsenthalpie von SnJ4 . Monatshefte für Chemie 104, 376–388 (1973). https://doi.org/10.1007/BF00903102

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  • DOI: https://doi.org/10.1007/BF00903102

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