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25/Enero/2000
EXAMEN DE QUÍMICA 3º BUP. REACCIONES QUÍMICAS
1-. Sabemos que el rendimiento de la reacción química entre el Carbonato Cálcico y el ácido Clorhídrico es del 68% ¿De que masa de ácido Clorhídrico puro debemos partir para obtener 16,8 litros de Dióxido de Carbono en Condiciones normales?
2-. Halla el rendimiento de la reacción entre el hidróxido Sódico con el ácido acético, sabiendo que cuando se parte de 10 gramos de NaOH se obtienen 16,4 gramos de acetato sódico (CH3COONa)
3-. Quemamos 6,6 gramos de propano en presencia de 33,6 litros de Oxígeno medidos en condiciones normales. Halla el volumen de Dióxido de Carbono que se desprende en condiciones normales, a lo largo de la reacción de combustión:
C3H8 + O2 CO2 + H2O
4-. Introducimos 15,8 gramos de Oxido de Cinc y 21,9 gramos de ácido Clorhídrico, en un recipiente de 25 litros a la Tº de 18ºC. Halla la presión en el interior del matraz antes y después de producirse la reacción.
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Enviado por: Sonia Ramos Idioma: castellanoPaís: España