4Li + O2 = 2Li2O....................................................................................
4 4 Xg
2H2+O2-->2H2O
32 2*18
M(H2)=2g/mol, M(O2)=32 g/mol, M(H2O)=18g/mol
n(H2)=m/M=4/2=2 mol
n(O2)=4/32=0.125 mol
n(H2)>n(O2)
4/32 = X/36
X=4.5 g - H2O
n(H2O)=m/M=4.5/18=0.25 mol
ответ 4.5 г,0.25 моль
<span>2) хлороводород и хлор.............</span>
A)Ca->CaO->Ca(OH)2->CaCl2
1)2Ca+O2=2CaO
2)CaO+H2O=Ca(OH)2
3)Ca(OH)2+2NaCl=CaCl2+2NaOH
б)CuO->CuCl2->Cu(OH)2->CuSO4
1)CuO+2HCl=CuCl2+H2O
2)CuCl2+2NaOH=Cu(OH)2+2NaCl
3)Cu(OH)2+H2SO4=CuSO4+2H2O