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7-21. El cloruro de metilamonio se presenta en tres formas cristalinas, denominadas B, y, y a, entre OK y 298,15 K. La capacidad calorfica molar

7-21. El cloruro de metilamonio se presenta en tres formas cristalinas, denominadas B, y, y a, entre OK y 298,15 K. La capacidad calorfica molar a presin constante del cloruro de metilamonio en funcin de la temperatura se tabula a continuacin. La transicin B+ y ocurre a 220.4 K con 4. H = 1.779 kJ moll y la transicin y a ocurre a 264.5 K con A 2.818 kJ.mol-!. Suponiendo que la capacidad calorfica del cloruro de metilamonio slido puede describirse mediante la teora de Debye hasta 12 K, calcule la entropa molar del cloruro de metilamonio a 298,15 K. bor T/K CP/IK 'mol- T/K Cp/IK mol- 12 15 20 30 40 50 0.837 1.59 3,92 10.53 18.28 25.92 32.76 38.95 44.35 49.08 53.18 59.50 64.81 09.4 220 230 210 220.4 222 77 280 260 295 73.72 77.95 79.71 b y Transicin 82.27 87.03 84.27 87.03 YA Transicin 88.16 89.20 90.16 90,63 70 80 90 100 120 140 160)

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