H₃PO₄+3NaOH=Na₃PO₄+3H₂O
m(NaOH)=(25*200)100=50 г
n(NaOH)=50/40=1,25 моль
NaOH:Na₃PO₄=3:1 => n(Na₃PO₄)=0,42
m(Na₃PO₄)=164*0,42=68,88 г
4P+5O2-->2P2O5
P2O5+3H2O-->2H3PO4
H3PO4+3KOH-->K3PO4+3H2O
K3PO4+Ba(OH)2-->3KOH+Ba3(PO4)2
450CH2=CCl-CH=CH2 --- [-CH2-CCl=CH-CH2-]450
-CH2-CCl=CH-CH2- структурное звено
M(-CH2-CCl=CH-CH2-)*450=88.5*450=39825
С4Н9
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СН3-СН- СН2 - С-CH2-CH2-CH3
Ι Ι
СН3 F
1) 3H2SO4+2Al (OH)3=Al2(SO4)3+6H2O
2)Al2 (SO4)3+3Ba (OH)2=3BaSO4+2AL (OH)3
H2SO4+Cu (OH)2=CuSO4+2H2O