Răspuns:
17,01 y
------- -------
S + O2 -> SO2
--- -------
32 64
100g impur S...........56,7g pur S
30g impur S..............x
x= 17,01g
M SO2 = 32+32 = 64g/mol
y= 34,02 g SO2
34,02 z w
------ ------ -----------
SO2 + H2O -> H2SO3
----- ----- ----------
64 18 82
z= 9,56 g H2O
w= 43,58 g H2SO3
M H2SO3 = 2+32+48 = 82g/mol
Explicație: