Răspuns :
Răspuns:1] se afla ms=md+mH2O=80+240=320g C%=md.100/ms=80.100/320=25% 2] C%=md.100/ms ms=md.100/C%=180.100/15=1200g solutie se stie ca ms= md+mH2O mH2O=ms-md= 100-180=1020gH2o 3] ms=600g C%=5% C%=md.100/ms md=C%.ms/100= md=5%.600/100=30g
Na Z=11 1s2 2s2 2p6 3s1 C Z=6 1s2 2s2 2p2 Al Z=13 1s2 2s2 2p6 3s2 3p1 P Z=15 1s2 2s2 2p6 3s2 3p3
Explicație: