1. Ca+Cl₂=CaCl₂
Masa molara CaCl₂=40+71=111
x=masa de CaCl₂
x=40·111/40=111g CaCl₂
1mol CaCl₂.......111g
x moli................111g
x=1 mol
2.S+O₂=SO₂
1 mol..........22,4l
x moli..........2,24l
x=2.24·1/22,4=0.1 moli O2
1mol.......32g O₂
0,1moli......y
y=0,1·32/1=3.2g O₂
Masa molara SO₂=32+32=64
z=masa de SO₂
z=3,2·64/32=6,4g SO₂
1mol.......64g SO₂
q moli........6,4g SO₂
q=6,4/64=o.1 moli SO₂
1 mol.........6,023·10²³
0,1 moli.......w
w=0,1·6,023·10²³/1=0,6023·10²³ particule SO²
