<span>метан+кислород=<span> в</span>ода +диоксид углерода</span>
CuO+H2=Cu+H2O
Cu+Cl2=CuCl2
CuCl2+2KOH=2KCl+Cu(OH)2
Cu(OH)2+H2SO4=CuSO4+2H2O
CuCl2+Fe=FeCl2+Cu
2Cu+O2+2CuO
CuO+2HNO3=Cu(NO3)2+H2O
Cu(NO3)2+2NaOH=Cu(OH)2+2NaNO3
0.5 л = 500 мл
14% от 500 мл:
(500/100)*14 = 70 мл
p = 1.13 г/мл ==> m(p-pBaCl2)= 1.13 * 70 = 79.1 г
16г х (35г)
CaCI2+2AgNO3=Ca(NO3)2 +2AgCI
111г 286г х=16*286/111=41,2г
41,2г----100%
35г------х% х=84,9%
B20
1) MgO + 2HBr = MgBr2 + H2O
MgO + 2H⁺+2Br⁻ = Mg²⁺+2Br⁻+H2O
2) MgO + 2HClO4 = Mg(ClO4)2 + H2O
MgO + 2H⁺+2ClO4⁻ = Mg²⁺+2ClO4⁻+H2O
B21
1) Fe(OH)₃ + 3HBr = FeBr3 + 3H2O
Fe(OH)₃+3H⁺+3Br⁻ = Fe³⁺ + 3Br⁻ + 3H2O
2) Fe(OH)3 + 3HNO3 = Fe(NO3)3 + 3H2O
Fe(OH)3 + 3H⁺3NO₃⁻ =Fe³⁺3NO₃⁻+3H2O
B22
1) H3PO4 + 3KOH = K3PO4 + 3H2O
3H⁺+PO₄³⁻+3K⁺+3OH⁻ = 3K⁺+PO₄³⁻+3H2O
2) H3PO4 + 3LiOH = Li3PO4+3H2O
3H⁺+PO₄³⁻+3Li⁺+3OH⁻ = 3Li⁺+PO₄³⁻+3H2O