A) 2СH4 = C2H2 + 3H2 (t=1500C)
C2H2 + H2O = CH3CHO (Hg2+, H+)
CH3CHO + H2 = C2H5OH
C2H5OH + HBr = C2H5Br + H2O
C2H5Br + KOH(спиртовой) = С2H4 + KBr + H2O
C2H4 + H2O = C2H5OH (H2SO4)
3C2H5OH + 4H2SO4 + K2Cr2O7 = 3CH3CHO + 2KCr(SO4)2 + 7H2O
б) CH4 + O2 = 2HCOH (t, кат.)
HCOH + H2 = CH3OH
CH3OH + HCl = CH3Cl + H2O
2CH3Cl + 2Na = C2H6 + 2NaCl
C2H6 + O2 = C2H5OH (t, кат.)
<span>5C2H5OH+4KMnO4+6H2SO4=5CH3COOH+4MnSO4+2K2SO4+11H2O </span>
2Na+2H2O=2NaOH+H2
NaOH+HCl=NaCl+H2O
NaCl+HNO3=NaNO3+HCl
1) Cu + H2SO4 → CuSO4+H2
2) CuSO4+2NaOH→Cu(OH)2-Na2SO4
Cu(2+)+SO4(2-)+2Na(+)+2OH(-)→Cu(OH)2+2NA(+)+SO4(2-)
Cu(2+)+2OH(-)→Cu(OH)2
3) Cu(OH)2+2HNO3→Cu(NO3)2+2H2O
200----100\%
х-------5\%
х=5*200/100
х=10 г соли
200-10=190 г воды