Hóa 9 Nồng độ

Yorn SWAT said:

2,
Mg + 1/2O2 = MgO + 2HCl = MgCl2 + H2O
a.........a/2........a..........2a
Cu + 1/2O2 = CuO + 2HCl = CuCl2 + H2O
b..........b/2.......b..........2b
4Al + 3O2 = 2Al2O3 + 12HCl = 4AlCl3 + 6H2O
c........3c/4......c/2...........3c
mO2 = mY - mX = 2.4 g => nO2 = 0.075 mol
Ta thấy nHCl = 4nO2 = 0.3 mol => VHCl = 0.15 l
3,
Fe + 2HCl = FeCl2 + H2
a........2a....................a
FeCO3 + 2HCl = FeCl2 + H2O + CO2
b................2b...................................b
=> a+ b = 0.3 mol
View attachment 135511
=> a/b = 2/1 => a=0.2; b=0.1
=> m = 22.8 g
nHCl = 0.6 mol
=> CM HCl = 1 l

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