a)
2KMnO4 --to--> K2MnO4 + MnO2 + O2
2Cu + O2 --to--> 2CuO
b)
\(n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\)
=> \(n_{O_2}=0,1\left(mol\right)\)
=> \(V_{O_2}=0,1.22,4=2,24\left(l\right)\)
c) \(n_{KMnO_4}=0,2\left(mol\right)\)
=> \(m_{KMnO_4}=0,2.158=31,6\left(g\right)\)
2KMnO4-to>K2MnO4+MnO2+O2
0,2----------------------------------------0,1 mol
2Cu+O2-to>2CuO
0,2---0,1------0,2
n CuO=\(\dfrac{16}{80}\)=0,2 mol
=>VO2=0,1.22,4=2,24l
=>m KMnO4=0,2.158=31,6g