Question

ajutatima varog  la chimie pentru cl a 8
ex 3 si 6

Answer 1

3) Raspun corect: c) Cu(OH)₂, Fe(OH)₃, Zn(OH)₂

6) CaO+H₂O=Ca(OH)₂

Masa molara CaO=40+16=56g/mol
Masa molara Ca(OH)₂=40+2*16+2*1=74g/mol
x=masa de Ca(OH)₂ obtinuta
x=112*74/56
x=148kg Ca(OH)₂

Masa molara H₂O=2+16=18g/mol
y=masa de H₂O reactionata
y=112*18/56
y=36kg H₂O=36000g H₂O

1mol...............................18g
z moli..............................36000g
z=36000*1/18
z=2000moli

1mol..............................22.4L
2000moli.......................q
q=2000*22.4/1
q=44800L