17.110 Synthetic diamonds are made under conditions of high temperature (2000 K) and high pressure (1010 Pa; 105 atm) in the presence of catalysts. Car- bon's phase diagram is useful for finding the conditions for formation of natural and syn- thetic diamonds. Along the diamond-graphite line, the two allotropes are in equilibrium. (a) At point A, what is the sign of AH for the formation of dia- Diamond A Liquid Graphite Vapor. mond from graphite? Explain. (b) Which allotrope is denser? Explain. Temperature Pressure

17.110 Synthetic diamonds are made under conditions of high temperature (2000 K) and high pressure (1010 Pa; 105 atm) in the presence of catalysts. Car- bon's phase diagram is useful for finding the conditions for formation of natural and syn- thetic diamonds. Along the diamond-graphite line, the two allotropes are in equilibrium. (a) At point A, what is the sign of AH for the formation of dia- Diamond A Liquid Graphite Vapor. mond from graphite? Explain. (b) Which allotrope is denser? Explain. Temperature Pressure

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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АPPENDI х В + Thermodynamic Data Thermodynamic Data for Selected Elements and Inorganic Compounds at 1 bar and 298 K“ Substance AfĦ°/kJ · mol¯! Af&/kJ· mol¯ §/J·K-1. mol T;,/J·K-1 .mol- Ag(s) 42.7 25.49 Ag+(aq) 105.9 77.11 72.68 37.66 AgBr(s) -99.5 -95.94 107.11 52.38 AgCl(s) -127.0 -109.72 96.2 50.79 AgI(s) -62.4 -66.3 114.2 54.43 AgNO3(s) -129.4 -33.41 140.9 93.05 Al(s) 28.32 24.34 Al3+ (aq) -531.0 -485 -321.7 AICI3(s) -704.2 -628.8 110.67 91.84 Al,O3(s) -1669.8 -1576.4 50.99 78.99 Ar(g) Ba(s) Ba2+(aq) 154.8 20.79 62.8 26.36 -537.6 -560.8 10 BaO(s) -553.5 -525.1 70.3 47.45 BaCl2(s) -858.6 -810.9 123.7 75.31 BaSO (s) -1464.4 -1353.1 132.2 101.75 Be(s) 9.54 17.82 BeO(s) -610.9 -581.6 14.1 25.4 Br2(1) 152.23 75.69 Br (aq) -121.6 -103.96 82.4 HBr(g) -36.4 -53.45 198.7 29.12 C(graphite) 5.7 8.52 C(diamond) 1.90 2.87 2.4 6.11 CO(g) -110.5 -137.3 197.9 29.14 CO2(9) -393.5 -394.4 213.6 37.1 "Data are mostly from the NBS Tables of Chemical Thermodynamic Properties (1982). The values for ions…