Răspuns:
-se calculeaza masele molare ale substantelor indicate in problema
M,Fe(OH)2= 90g/mol M,NaOH=40g/mol
-calculez moli Fe(OH)2
niu= m/M= 180g/90g/mol= 2molFe(OH)2
-deduc moli NaOH din ecuatia chimica
2mol....................................................1mol
2NaOH + FeCl 2----> 2NaCl + Fe(OH)2
x..............................................................2mol
x=niu,NaOH= 4mol
-calculez masa celor 4 moli de NaOH
m=niuxM= 2molx40g/mol=.........................calculeaza !!!!!
Explicație:
