4P+5O2==to==> 2P2O5
a) \(n_{P_2O_5\left(lt\right)}=\dfrac{2}{4}.n_P=\dfrac{2}{4}.0,2=0,1\left(mol\right)\)
\(m_{P_2O_5}=0,1.142=14,2\left(g\right)\)
\(H=\dfrac{14}{14,2}.100\%\simeq98,6\%\)
b) \(n_{P_2O_5}=\dfrac{28,4}{142}=0,2\left(mol\right)\)
\(n_{O_2}=\dfrac{5}{2}.n_{P_2O_5}=\dfrac{5}{2}.0,2=0,5\left(mol\right)\)
\(m_{O_2}=0,5.32=16\left(g\right)\)
\(V_{O_2}=0,5.22,4=11,2\left(l\right)\)
PTHH \(4P+5O_2-t^0\rightarrow2P_2O_5\\ \)
a)theo gt: \(n_P=0,2\left(mol\right)\)
Theo PTHH :\(n_{P_2O_5}=\frac{1}{2}n_P=\frac{1}{2}\cdot0,2=0,1\left(mol\right)\\ \Rightarrow m_{P2O5}=0,1\cdot142=14,2\left(g\right)\)
ma theo thuc te m\(_{P2O5}=14\left(g\right)\Rightarrow HS=\frac{14\cdot100\%}{14,2}\approx98,6\%\)
b)Theo gt: \(n_{P2O5}=\frac{28,4}{142}=0,2\left(mol\right)\)
Theo PTHH:
\(n_{O2}=\frac{5}{2}n_{P2O5}=\frac{5}{2}\cdot0,2=0,5\left(mol\right)\\ \Rightarrow m_{O2}=0,5\cdot32=16\left(g\right)\\ V_{O2}=0,5\cdot22,4=11,2\left(l\right)\):