Неметаллами являются (2) это углерод и кремний
Mr(спирта) = В(спирта)N2 = 28г/моль * 2,64 = 73,92 ≈ 74
М(Н2CrO4)=1·2+52+16·4=118г/моль
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1) 4Al + 3O2 --> 2Al2O3
Al(0)-восстановитель;
О2(0)-окислитель.
2) Al2O3 + 6HCl --> AlCl3 + 3H2O
3) AlCl3 + 3NaOH --> Al(OH)3 + 3NaCl
Al(+3) + 3Cl(-1) + 3Na(+1) + 3OH(-1) --> Al(OH)3(осадок) + 3Na(+1) + 3Cl(-1)
Al(+3) + 3OH(-1) --> Al(OH)3
4) Al(OH)3 + 3HNO3 -->Al(NO3)3 + 3H2O