-calculez nr. moli atomi O
n(niu)= N/N,A; n= 5,4198x10²³at/ 6,o23x10²³at/mol= o,9 mol O
-Calculez mol KClO3 si mol K care contin 0,9molO
3molO.........1mol KClO3........1molK
0,9mol.......n= 0,3molKClO3......n= 0,3mol K
m,K= nxA,K=> 0,3molx39g/mol=.....................calculeaza !!!!
m,KClO3= n xM,KClO3=> 0,3molx 122,5 g/mol= 36,7g
p/100= m,p/ m,impur--> p= 36,7x100/ 40=......................calculeaza !!!!