Răspuns:
Explicație:
2. c
H2O-------->16g O
Ca(OH)2----->32gO
Al2(CO3)3 -------->144g O
3. b
MH2SO4=2 + 16 + 4.16=98--------> 98g/moli
m= n . M
m= 4moli . 98g/moli =392 g H2SO4
4. c
1mol NaOH----------6,023.10²³molecule
5.
MN2= 2.14=28------> 28g/moli
6.
MH2O= 2+ 16=18------> 18g/moli
18g H2O---------1molH2O
180g --------------------x
x= 180 g: 18g/moli=10 moli H2O
