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"Se saca con los g" con regla de 3 !
Na2S + 2HCl -----> H2S + 2NaCl
156g 160g
Mr de Na2S = 78g
Mr de 2HCl = 73g
Si con 78g de Na2S --> 73g de HCl
con 156g de Na2S -> X= 146g de HCl <--cantidad de HCl que se necesita en la reacción !
160g de HCl <--cantidad de HCl que tenes !
Entonces con esto sabes que el HCl es el reactivo en exceso. Por lógica solo hay un reactivo en exceso y un reactivo limitante. Pero hace el otro para sacarte las dudas.
Si con 73g de HCl --> 78g de Na2S
con 156g de Na2S ->X= 170,96g de Na2S <--cantidad que se necesita en la reacción !
156g de Na2S <--cantidad de Na2S que tenes !
Acá está el reactivo limitante. El Na2S acaba más rápido (precoz donde !) xD
Nota: Si encontras el Reactivo Limitante no hace falta probar con el otro pero sirve para verificar para no equivocarte !
Espero que sirva esta explicación, así lo explicó Burman y Sanchez ! :P
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