Zad.1
Mg+ H2SO4---> MgSO4 + H2
MMg= 24 g/mol
MMgSO4= 24+ 32+64=120 g/mol
24 g Mg------- 120 g MgSO4
6 g Mg------- x g MgSO4
x= 30 g MgSO4
zad.2
2 Na + S---> Na2S
MNa= 23 g/mol
MNa2S= 2*23+ 32=46+32=78 g/mol
2*23 g Na------ 78 g Na2S
y g Na ------ 2 g Na2S
y≈ 1,18g Na2S
