1) n=m/M. M(Na3PO4)=164. n=348/164=2,12.
2) m=n*M. M(MnSO4)= 151. m=151*9=1359.
3) N=m*Na/M. M( P2O5)= 142. N=25*6,02*10^23/142=1,1*10^23
СН2 - О - СО - С17Н33 СН2 - О - СО - С17Н33Br2
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CH - О - СО - С17Н33 + 3Br2 - > CH - О - СО - С17Н33Br2
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СН2 - О - СО - С17Н33 СН2 - О - СО - С17Н33Br2
CaO + H2O = Ca(OH)2
n = m/M
n(CaO) = 45/56 = 0,8 моль = n(Ca(OH)2)
m(Ca(OH)2) = 0,8*74 = 59,2 г
H2N-CH2-COOH+C2H5OH----(H2SO4)--->H2O + H2N-CH2-COOC2H5
H2N-CH2-COOH+CH3OH----(H2SO4)--->H2O + H2N-CH2COOCH3