Question

Ajutor va rogggggggg euuuuu​

Answer 1

Răspuns:

1.

a)

H2O2

r.at.H:O=2:2=1:1

r.m H:O=2:32=1:16

MH2O2 =2×1+2×16=34g/mol

b)

AlCl3

r.at. Al: Cl=1:3

r.m Al:Cl=27:106,5

MAlCl3 =27+3×35,5=133,5g/mol

c)

H3PO4

r.at H:P:O=3:1:4

r.m H:P:O=3:31:48

MH3PO4 =3×1+31+3×16=82g/mol

d)

Al(OH)2

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

r.m Al:O:H=27:48:3=9:16:1

MAl(OH)3=27+3×16+3×1=78g/mol

2.

a) N2 +3H2 => 2NH3

b) 2H2O + O2 => 2H2O2

c) 4Al +3O2 => 2Al2O3

d) 2Na + 2H2O => 2NaOH + H2

e) 2 Al + 6HCl => 2AlCl3 + 3H2

f) 2KClO3 => 2KCl + 3O2

3.

MNaOH=23+16+1=40g/mol

40g NaOH.......23gNa

120gNaOH.......xg Na

x=120×23/40=calculează

Answer 2

Bafta!!! Sper ca te am ajutat!