a)
2Na + 2H2O --> 2NaOH + H2
Ca + 2H2O --> Ca(OH)2 + H2
FeO + H2 --to--> Fe + H2O
b) \(n_{FeO}=\dfrac{14,4}{72}=0,2\left(mol\right)\)
Gọi \(\left\{{}\begin{matrix}n_{Na}=2x\left(mol\right)\\n_{Ca}=x\left(mol\right)\end{matrix}\right.\)
PTHH: 2Na + 2H2O --> 2NaOH + H2
2x----------------------->x
Ca + 2H2O --> Ca(OH)2 + H2
x-------------------------->x
FeO + H2 --to--> Fe + H2O
0,2-->0,2
=> x + x = 0,2
=> x = 0,1 (mol)
=> a = 0,2.23 + 0,1.40 = 8,6 (g)