CALCIUM SULFATE HEMIHYDRATE - (26499-65-0)

परिचय

नाम: calcium sulfate hemihydrate; Plaster of Paris
* IUPAC
सीएएस संख्या: 26499-65-0
रासायनिक सूत्र: CaSO40.5H2O
अणु भार: 154.15588 g
मास प्रतिशत: Ca 25.998 %; S 20.800 %; O 41.514 %; H 1.3076 %; O 10.378 % 

वर्गीकरण

उपयोग करता है / समारोह

• "The hemihydrate is used for wall plasters; wallboard; tiles and blocks for the building industry; moldings; statuary; in the paper industry." 1

संबंध

ऊष्मारसायन

ΔHf° (s alpha macro): -376.85 kcal/mol 2 = -1,576.74 kJ/mol
ΔHf° (s beta micro): -376.35 kcal/mol 2 = -1,574.65 kJ/mol
S° (s alpha macro): 31.2 cal/(mol•K) 3 = 130.54 J/(mol•K)
S° (s beta micro): 32.1 cal/(mol•K) 3 = 134.31 J/(mol•K)
ΔGf° (s alpha macro): -343.41 kcal/mol 4 = -1,436.83 kJ/mol
ΔGf° (s beta micro): -343.18 kcal/mol 4 = -1,435.87 kJ/mol

अधिक जानकारी के लिए

सूत्रों का कहना है

(1) - The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals, 13th ed.; Budavari, S.; O'Neil, M.J.; Smith, A.; Heckelman, P. E.; Kinneary, J. F., Eds.; Merck & Co.: Whitehouse Station, NJ, 2001; entry 1711.
(2) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(3) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.
(4) - Dean, John A. Lange's Handbook of Chemistry, 12th ed.; McGraw-Hill Book Company: New York, NY, 1979; p 9:4-9:94.