Ceramics-Silikáty 31, (2) 117 - 120 (1987) |
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DETERMINING THE STANDARD ENTHALPY OF FORMATION, GIBBS' ENERGY OF FORMATION AND ABSOLUTE ENTROPY OF 3CaO.Al₂O₃.CaCO₃.11H₂O
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Šatava Vladimír
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Institute of Chemical Technology, Department of the Technology of Silicates, Suchbátarova 5, 166 28 Prague 6
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The method of differential hydrothermal analysis (DHA) was used to determine the equilibrium temperature and reaction enthalpy of the reaction
C₄ACH₁₁(s) = C₃AH₆(s) + CC(s) + 5H(l);
Tr = (403 ± 2) K and Δr H° = (52.42 + 2.09) kJmole⁻¹.
From these values, the standard enthalpy of formation for C₄ACH₁₁(s)
Δf H° (298 K) = (-8204.0 ± 2.1) kJmole⁻¹,
entropy
S° (298 K) = 689.48 JK⁻¹mole⁻¹,
and standard Gibbs' energy of formation
Δf G° (298 K) = -7300 kJmole⁻¹,
were calculated.
Evidence for the reliability on the data measured was presented. |
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