20%=8/m(р-ра)*100
m(р-ра)<span>=40гр</span>
Mg3(PO4)2=3Mg(+2)+2PO4(-3)
1)a.C6H12O6=2C2H5OH+2CO2
2C2H5OH= CH2=CH-CH=CH2+2H2O+H2
CH2=CH-CH=CH2+2HCl= CH3-CHCl-CHCl-CH3
b.CO+2H2=CH3OH
2CH3OH+2Na=2CH3ONa+H2
c.2CH3OH=CH3-O-CH3+H2O
C2H4+H2O=C2H5OH
CH3-CH2OH+CuO=CH3-COH+H2O+Cu
2)2CH3-CH-OH= CH3-CH-O-CH-CH3+H2O
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CH3 CH3 CH3
C2H5COOH + C4H9OH ------H2SO4 -----> C2H5COOC4H9 + H2O