Question

Se dau reactiile : CH4=C2H2 +H2, C2H2 +H-CN= CH2=CH-CN, nCH2=CH-CN-----(-CH2-CH(CN)-)n, egaleaza-le si calculeaza masa de compus poliacrilonitril daca se pleaca de la 4kg metan de puritate 98% iar randamentul global al celor 3 reactii este 40%

Answer 1

4kg=4000g

puritatea=mpur/mimpur*100==>mpur=p*mimpur/100=98*4000/100=3920g CH4 pur

32g,,,,,,,,,,,.26g
2CH4 --> HC≡CH + 3H2
3920g.......x=3185g

n=mp/mt*100==>mp=n*mt/100=40*3185/100=1274g C2H2

26g.............................53g
HC≡CH + H-CN --> CH2=CH(CN)
1274g.......................x=2597g

n=mp/mt*100==>mt=mp*100/n=2597*100/40=6492.5


53g.................................53g
nCH2=CH(CN) ---> [-CH2-CH(CN)-]n 
6492.5g........................6492.5g

n=mp/mt*100==>mp=n*mt/100=40*6492.5/100=2597g poliacrilonitril

Macrilonitril=53g/mol
MCH4=16g/mol
MC2H2=26g/mol