Question

Rezolvati va rog 2 si 3 rapid dau test

Answer 1

Răspuns:

2.

a) F

b) A

c) F

d) A

e) F

f) F

3.

H₃PO₃

raport atomic=H:P:O=3:1:3

raport de masa=H:P:O=3:31:48

compozitie procentuala

MH₃PO₃=3×1+31+3×16=82g/mol

82g H₃PO₃.................3gH...............31gP.............48gO

100g H₃PO₃................xgH..................ygP.................zgO

x=100×3/82=calculeaza

y=100×31/82=calculeaza

z=100×48/82= calculeaza

4.

MAl=27g/mol

n=m/M=N / Na

n=1,8/27=0.06moli Al

N = n x Na = 0.06×6,023 x 10²³ atomi= calculeaza

Explicație:

Na =6,023 x 10²³ atomi