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Heat capacity from 12 to 305°K and entropy of talc and tremolite

Journal of Physical Chemistry

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DOI: 10.1021/j100805a003

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Abstract

The heat capacities of talc, Mg3Si4O10(OH)2, and tremolite, Ca2Mg6Si8O22(OH)2, have been measured between 12 and 305??K. Smoothed values of heat capacity, entropy, enthalpy, and free energy are tabulated. At 298.15?? K. the values of the thermodynamic functions are: talc, Cp?? = 76.89 ?? 0.23 cal. deg.-1 mole-1, S?? = 62.33 ?? 0.19 cal. deg.-1 mole-1, H?? - H6?? = 11,206 ?? 34 cal. mole-1; tremolite, Cp?? = 156.7 ?? 0.6 cal. deg.-1 mole-1, S?? = 131.2 ?? 0.5 cal. deg.-1 mole-1, H?? - H6?? = 23,335 ?? 90 cal. mole-1. From the equilibrium data of Bowen and Tuttle and the entropy of talc, the heat of formation of talc from MgO, SiO2, and H2O (liq.) is calculated to be ??H??f298 = -43.6 ?? 1 kcal.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Heat capacity from 12 to 305°K and entropy of talc and tremolite
Series title:
Journal of Physical Chemistry
DOI:
10.1021/j100805a003
Volume
67
Issue:
11
Year Published:
1963
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Physical Chemistry
First page:
2252
Last page:
2256
Number of Pages:
5