2KMnO4-to-> K2MnO4 + MnO2 + O2
nKMnO4= 22.12/158=0.14 (mol)
=> nK2MnO4= 0.07 (mol) => mK2MnO4= 13.79g
=> nMnO2= 0.07 (mol) => mMnO2= 6.09g
mhhr= 13.79+6.09=19.88g< 22.12g => KMnO4 dư
Đặt: nKMnO4(pư)=x (mol)
mhhr= mKMnO4 (dư) + mK2MnO4 + mMnO2= 22.12 - 158x+ 0.5x197+ 0.5x87=21.16
=> x= 0.06
2KMnO4 + 16HCl(đ) -to-> 2KCl + 2MnCl2 + 5Cl2 + 8H2O
=> nCl2= 0.06*5/2= 0.15 (mol)
VCO2= 0.15*22.4=3.36l
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