\(n_{Na}=\dfrac{9,2}{23}=0,4\left(mol\right)\\ a,2Na+2H_2O\rightarrow2NaOH+H_2\uparrow\\ b,n_{H_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\\ c,n_{NaOH}=n_{Na}=0,4\left(mol\right)\\ m_{NaOH}=0,4.40=16\left(g\right)\)
a) 2Na + 2H2O --> 2NaOH + H2
b) \(n_{Na}=\dfrac{9,2}{23}=0,4\left(mol\right)\)
PTHH: 2Na + 2H2O --> 2NaOH + H2
0,4--------------->0,4---->0,2
=> \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c) \(m_{NaOH}=0,4.40=16\left(g\right)\)