Question

Va rog helppp!! Multumesc anticipat!

Answer 1

1.se calc .puritatea ZnS : 200.85: 100=170 g ZnS MZnS=64+32=96------->1mol=96g                                                                                  96 g ------------------64g Zn                                                                                    170g----------------------xg                                                                                   x=170.64:96=113,3 g Zn
2.Na2SO4            M=2.23+32+4.16=142------->1mol=142g142g Na2SO4-------------46G Na                                                                         300g------------------xg                                                                                                                       x=300.46:142=97,18 g Na
3. rezolva singur dupa model                                                                                       4.Mg3( PO4)2                  Al (NO3)3                    HCl                     K2S
5.MMg3(PO4)2=3.24+2.31+8.16=                                                                    calculeaza singur dupa model
6.metale: K ,Cu ,Zn, Al, Feia sist. periodic si scrie elementele