Ejercicio Brenda.docx

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DATOS: g NaOH =? 8 g Na pureza = 57% 8 g H2O %R= 71% Na + H2O → NaOH + H2 SOLUCIÓN : 8 g Na * 71g /100g = 5.68 g Na Se balancea la reacción : 2Na + 2 H20 → 2 NaOH + H2 2 mol 2 mol 2 mol 1 mol 2 *23g 2*18 g 2*40g 2g 46 g 36 g 80 g 2g Ahora se calcula reactivo limitante y exceso : 8 g Na * 36 gH2O/ 46 g Na = 6.26 g Na 8 g H2O * 46 gNa / 36 g H2O= 10.22 g H2O . El H2O es el reactivo limitante y el Na es el reactivo en exceso 8 g H2O * 80 gNaOH/ 36 gH2O= 17.77 g NaOH RT %R = RR/RT*100 Se despeja RR: RR= %R* RT/100 RR= 71 * 17.77 NaOH/100= 12.61 g NaOH

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