Question

va rog imi trebuie rapid​

Answer 1

Răspuns:

a) Al2(SO4)3

r.at.Al:S:O=2:3:12

r.m. Al:S:O=54:96:192

MAl2(SO4)3=2×27+3×32+12×16=342g/mol

1mol Al2(SO4)3=342g

b) Al2O3

r.at.Al:O=2:3

r.m.Al:O=54:48

MAl2O3=2×27+3×16=102g/mol

1 mol Al2O3 =102g

c) Fe(OH)3

r.at.Fe:O:H=1:3:3

r.m.Fe:O:H=56:48:3

MFe(OH)3=56+3×16+3×1=107g/mol

1molFe(OH)3=107g

d) KClO4

r.at.K:Cl:O=1:1:4

r.m.K:Cl:O=39:35,5:64

MKClO4=39+35,5+4×16=138,5g/mol

1mol KClO4=138,5g

e) Zn(NO3)2

R.At. Zn:N:O=1:2:6

r.m.Zn:N:O=65:28:96

MZn(NO3)1=65+2×14+6×16=189g/mol

1mol Zn(NO3)2= 189g