ma poate ajuta si pe mine cineva? repede va rog!
Răspunsuri la întrebare
f. ) ANe=20-----> 1mol de atomi de Ne
1mol Ne-----------6,023 .10²³ atomi Ne
x moli-----------6o,22 .10 ²³ atomi Ne
x=60, 22 . 10 ²³ : 6,023 .10 ²³ = 9,99 moli Ne
n=m:M ; n=nr. de moli ; m= masa subst. in g ; M= masa molara[g/moli ]
m=n.M
m= 9,99moli . 20 g/moli=199,8 g He
g. ) ANa =23
1mol de atomi Na-----------6,023 .10²³ atomi Na
y moli--------------------------12,044 .10 la 26 Na
y=12,044 .10 la 26 : 6,023. 10 ²³=1,99 . 10³ moli Na
m=n.M=1,99.10³ moli. 23g/moli
=45,77 . 10³ g Na
e.) Fe
A Fe= 56 11,2kg=11200g
1mol Fe----------56g Fe [ sau : n=m: M=11200 :56=200moli]
zmoli----------11200g Fe
z=11200:56=200moli Fe
1mol Fe ----------6,023 .10²³ atomi Fe
200 moli Fe--------------x atomi Fe
x=200.6,023 .1o²³=1204, 6 .10²³ atomi Fe