a) \(2KMnO_4\underrightarrow{^{to}}K_2MnO_4+MnO_2+O_2\)
b) \(n_{KMnO4}=\frac{94,8}{158}=0,6\left(mol\right)\)
\(n_{O2}=\frac{1}{2}n_{KMnO4}=\frac{1}{2}.0,6=0,3\left(mol\right)\)
\(\Rightarrow V_{O2}=0,3.22,4=6,72\left(l\right)\)
c) \(2Zn+O_2\underrightarrow{^{to}}2ZnO\)
\(n_{ZnO}=2n_{O2}=2.0,3=0,6\left(mol\right)\)
\(\Rightarrow m_{ZnO}=0,6.65=39\left(g\right)\)
a, 2KMnO4--->K2MnO4+ MnO2+ O2
b, nKMnO4= 94,8/158=0,6 mol
Theo ptpư:
0,6---------------->0,3 (mol)
VO2= 0,3.22,4= 6,72 (lit)
c, 2Zn + O2-----> 2ZnO
0,3------>0,6 (mol)
mZnO= 0,6.81= 48,6 (g)