Răspuns:
p= m,px100/m,i
m,i= 20g
deduc din reactii, masa de carbura pura
CH≡CH+ 2Br2--->: CHBr2-CHBr2
miu,C2H2= 26g/mol
miu C2H2Br4= 346g/mol
26g.......346g
x...............86,5g
x= m,acetilena= 6,5g
CaC2+H2O---> C2H2+ CaO
miu.CaC2= 64g/mol
64g........................26g
x..................................6,5g
x= m,CaC2 PUR=16g
p= 16x100/20= 80%
Explicație: