A) Neavand grupe -CH₂-OH => nu e bachelita, ci novolac
b) 2nC₆H₅-OH + nCH₂=O => (HO-C₆H₄-CH₂-C₆H₄-OH)n
fenol:formaldehida=2:1
c) 2n kmoli fenol........n kmoli CH2O..............n kmoli rasina
1,2x kmoli fenol.............a kmoli CH2O.............b kmoli rasina
a = 0,6 x
b = 0,6x
nr moli CH2O reactionati = 0,6x => exces de 0,4x
M rasina= 13*12 +12+32 = 200
n rasina = m/M = 1060/200 = 5,3kmoli
b = 0,6x = 5,3 => x = 8,8333 kmoli
m fenol = 1,2* 8,8333 * 94 = 996,4 kg fenol
m CH2O = 8,83333 * 30 = 265 kg CH2O
