MSi=28g/mol
n=V/Vmolar=2.24/22.4=0.1mol H2
1mol...................................................2mol
Si + 2NaOH + H2O --> Na2SiO3 + 2H2
x=0.05mol.......................................................0.1mol
n=m/M ==>m=n*M=0.05*28=1.4g Si
10/100*1.4=0.14 g Si