m = 48 g
M = 16 g/mol
n= v/ Vmol
n= m/M
n= 48/16
n = 3
v = n* Vmol
v = 3* 22.4 dm3
v = 67.2 dm3
2. 1mol - 98 g/mol
3mole - x
x= 3 * 98=298 g
3.
mMgS = x g
MMgS = 56 g/mol
mMg= 15 g
MMg = 24 g/mol
x/56 = 15/24
x = 56*15 / 24
x= 35 g
6.5g x
4. Zn + H2SO4 -> ZnSO4 + H2
65 g/mol 22.4 dm3
x= 6.5* 22.4 / 65
x = 0.24 dm3