a)
\(2Zn\left(NO_3\right)_2\rightarrow2ZnO+4NO_2+O_2\)
\(n_{Zn\left(NO3\right)2}=\frac{47,25}{189}=0,25\left(mol\right)\)
b)
\(n_{ZnO}=n_{Zn\left(NO3\right)2}=0,25\left(mol\right)\)
\(\Rightarrow m_{ZnO}=0,25.81=20,25\left(g\right)\)
c)
Theo PTHH:
\(n_{O2}=n_{Zn\left(NO3\right)2}=\frac{0,25}{2}=0,125\left(mol\right)\)
\(\Rightarrow V_{O2}=0,125.22,4=2,8\left(l\right)\)
2Zn(NO3)2----->2ZnO+2NO2+3O2
b) n Zn(NO3)2=47,25/189=0,25(mol)
n ZnO=n Zn(NO3)2=0,25(mol)
m ZnO=0,25.81=20,25(g)
c) n O2=3/2n Zn(NO3)2=0,375(mol)
V O2=0,375.22,4=8,4(l)