Ответ:
m(ZnO)=3.5г
Объяснение:
Zno+2hcl=zncl2+h20
Zn+2hcl=zncl2+h2
n(h2)=v/vm=2.24/22.4=0.1 моль
m(zn)=n×M=0.1×65=6.5г
m(zno)=10-6.5=3.5г
1) 2Cr + 3CaCl2 = 2CrCl3 + 3Ca
2) CrCl3 + 3NaOH = Cr(OH)3↓ + 3NaCl
3) 2Cr(OH)3 = Cr2O3 + 3H2O
4) Cr2O3 + 3K2S2O7 = Cr2(SO4)3 + 3K2(SO4)3
5) Cr2(SO4)3 + 3Br2 + 16KOH = K2Cr2O7 + 3K2SO4 + 6KBr + 8H2O
S-2 H+1
P+5 Cl-1
Al+3 C-4
H+1 Br-1
Ba+2 H-1
N+2 O-2