\(n_{O_2}=\frac{8,96}{22,4}=0,4\left(mol\right)\)
a) \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)
b) 0,8_______0,4_________0,4_____0,4(mol)
c) \(m_{KMnO_4}=0,8.158=126,4\left(g\right)\)
CHÚC BẠN HỌC TỐT
a,
2KMnO4➜K2MnO4+MnO2+O2
b,
nO2=\(\frac{8,96}{22,4}\) = 0,4(mol)
nKMnO4=\(\frac{0,4.2}{1}\) = 0,8 (mol)
nK2MnO4=\(\frac{0,4.1}{1}\) = 0,4(mol)
nMnO2=\(\frac{0,4.1}{1}\) = 0,4(mol)
mKMnO4=nKMnO4. MKMnO4=0,8.(39+55+16.4)=126,4(g)