Question

Salut,am nevoie de ajutor la tema de la chimie : Calculati concentratia procentuala a solutiei obtinute prin dizolvarea a 560g CaO in 1500g apa

Answer 1

M,CaO=56g/mol

M,H2O=18g/mol

M,Ca(OH)2=74g/mol

CaO consuma o masa de apa in reactia, din care rezulta Ca(OH)2

56g........18g..........74g

CaO +H2O----> Ca(OH)2

560g........x...............y

y= 740g Ca(OH)2   este substanta aflata in solutie,md

x= 180g H2O

ms= md+ m,apa= 740+(1500-180)=>2060g

C= mdx100/ms= 740x100/2060=.....................calculeaza !!!1