Răspuns:
AI VRUT SA SCRII MOLI !!!!
Explicație:
1.
n= m : M
M KOH= 39 + 16 + 1=56-----> 56g/moli
n= 11,2g : 56g/moli = 0,2 moli KOH
2.
1mol H2O-----------6,023.10²³molecule H2O
5moli-----------------------------x
x= 5 . 6,023.10²³ = 30,115 .10²³molecule H2O
MH2O= 2 + 16=18---------> 18g/moli
n= 90g : 18g/moli = 5moliH2O
5moli H2O-----> 30,115.10²³molecule H2O
3.
MCO2= 12 + 2.16=44--------> 44g/moli
44gCO2------------32 g O
17,6g CO2------------y
y=17,6 . 32 : 44 = 12,8 g O
n= 12 ,8 g : 32g/moli = 0,4 moli de O2
1mol de O2------------2 . 6,023.10²³atomi O
0,4moli O2----------------------------------z
z= 0,4 . 2 . 6,023.10²³ = 4,8184 .10²³ atomi O