Răspunsuri

2014-04-01T18:43:32+03:00
Raport atomic=2(Al):3(S):12(O) - reprezinta raportul nr de atomi ai fiecarui element
raport de masa = 2*27:3*32:3*4*16=54:96:192=9:6:32=3:2:16 - reprezinta raportul masei de fiecare element calculat ca n atomi * masa lui atomica
compozitia procentuala
%Al=m Al/m sulfat * 100=2*27/342 * 100
%S=m S/m sulfat * 100=3*32/342 * 100
%O=m O/m sulfat * 100=3*4*16/342 * 100