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Una soluci n de 5 0 0 kg de Na 2 SO 4 en 2 5 0 0 kg de agua se enfr a de

Una solucin de 500 kg de Na2SO4 en 2500 kg de agua se enfra de 333 K a 283 K en un
recipiente agitado de acero dulce de 750 kg de masa. A 283 K, la solubilidad de la sal anhidra
es de 8,9 kg/100 kg de agua y la fase cristalina estable es Na2SO4.10H2O. a 291 K,
el calor de la solucin es 78,5 MJ/kmol y las capacidades calorficas especficas de la solucin
y el acero dulce son 3,6 y 0,5 kJ/kg grado K respectivamente. Si, durante el enfriamiento, el 2 por ciento
del agua inicialmente presente se pierde por evaporacin, calcule el calor que debe
remoto.

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