Question

Soda caustica are 57,5% sodiu, 40% Oxigen si 2,5 % hidrogen.
calculati formula chimica a sodei caustice si stabileate denumirea stiintifica a acesteia stiind ca un mol de substanta cantareste 40 g.
repede va rog

Answer 1

Na: 57,23/23=2,48atomi gram Na
O: 40/16=2,5 atomi gram O
H: 2,5/1=2,5 atomi gram H
Impartim la cel mai mic: 
Na: 2,48/2,48= 1atom Na
O: 2,5/2,48=1 atom O
H: 2,5/2,48=1 atom H
Formula moleculara este; NaOH- hidroxid de sodiu
M NaOH= 23+16+1=40g/mol
1mol NaOH= 40g NaOH