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   1.-Calcule la composición de Ag 3 SbS 3 expresada en % en elementos ¿De qué mineral se trata? PIRARGIRITA ElementoP.MNo MolesPM mineral%Ag107.8683323.60559.755Sb121.751121.7522.482S32.065396.19517.763Total541.55100   2.-Determinar la composición porcentual en óxidos del siguiente mineral cuya fórmula química es (Fe 0.5 Mn 0.5 ) Nb 2 O 6 ¿A qué mineral corresponde? COLUMBITA %OXIDOS = PM oxido x No.Moles x 100PM totalÓxidosPM oxidoNo. MolesPeso Mineral% Oxido0.5 FeO71.8450.535.922510.6530.5 MnO70.9380.535.46910.519Nb2O5265.8121265.81278.828Total337.2025100   3.-Calcular en % en óxidos de Na 2 Mg 3 Al 2 (Si 4 O 11 ) 2 (OH) 2 ¿ De qué mineral se trata? GLAUCOFANA ÓxidosPMNo. MolesPM mineral% OxidoNa2O61.978161.9787.913MgO40.3053120.91515.432Al2O3101.9641101.96413.0138SiO260.0868480.68861.348 H2O181182.297 Total783.545100
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