Răspuns:
b.
MNaCl=23+35,5=58,5g/mol
MHCl=1,35,5=36,5g/mol
MH2SO4=2×1+32+4×16=98g/mol
MNa2SO4=2×23+32+4×16=142g/mol
2×58,5g.............98g.......142g.............2×36,5g
b) 2NaCl + H2SO4 → Na2SO4 + 2HCl
11,7g..................xg...............yg...................zg
x=11,7×98/2×58,5=calculeaza
y=11,7×142/2×58,5= calculeaza
z= 11,7×2×36,5/2×58,8= calculeaza
c.
MMg=24g/mol
MO2=2×16=32g/mol
MMgO=24+16=40g/mol
2×24g....32g.....2×40g
2Mg + O2 → 2MgO
4,8g.........xg..........yg
x=4,8×32/2×24=calculeaza
y=4,8×2×40/2×24=calculeaza
Explicație: