12. C + O₂ -> CO₂
12g C - 22,4dm³ CO₂
6g - x
x = 11,2dm³
13. S + O₂ -> SO₂
32g O₂ - 22,4dm³ SO₂
x - 11,2dm³
x = 16g
14. 2Cl₂ + O₂ -> 2Cl₂O
71g Cl₂ - 87g Cl₂O
x - 6,75g
x = 5,51g
1 mol Cl₂ - 22,4dm³ - 71g
x - 5,51g
x = 1,74dm³
15. d = m/V
a) O₂ - 32g - 22,4dm³
d = 32/22,4 = 1,43g/dm³
b) CO₂ - 44g - 22,4dm³
d = 44/22,4 = 1,96g/dm³
c) N₂ - 28g - 22,4dm³
d = 28/22,4 = 1,25g/dm³
d) H₂ - 2g - 22,4dm³
d = 2/22,4 = 0,09g/dm³
e) H₂S - 34g - 22,4dm³
d = 34/22,4 = 1,52g/dm³
16. d = m/V
d = 0,76g/dm³
V = 22,4dm³
m = d*V
m = 22,4 * 0,76 = 17,024g