PTHH: 2Na + 2H2O \(\rightarrow\) 2NaOH + H2\(\uparrow\)
mNaOH = \(\frac{120.10}{100}=12\left(g\right)\)
=> nNaOH = \(\frac{12}{40}=0,3\left(mol\right)\)
Theo PT: nNa = nNaOH = 0,3 (mol)
=> mNa = 0,3.23 = 6,9 (g) = X
mNaOH= 120*10/100=12g
nNaOH= 12/40=0.3 mol
Na + H2O --> NaOH + 1/2H2
0.3__________0.3
mNa=x= 0.3*23=6.9g