Question

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Answer 1

p= mpur/m impur*100 => m pur=80*20/100=16g CaC2

a) CaC2 + 2H2O = C2H2 + Ca(OH)2

b) MCaC2=ACa+2AC=40+2*12=64g/mol

MC2H2=2AC+2AH+2*12+2*1=26g/mol

64g CaC2............................26g C2H2
16g CaC2............................x=6,5g C2H2

90/100*6,5=5,85g C2H2

HC≡CH + Br2 + H2O = (HO)CH2-CH2Br + HBr

26g C2H2...................160g Br2
5,85g C2H2.................x=36g Br2

C=md/ms*100=>ms=md*100/C=36*100/2=1800g sol Br2

Imi spui daca e bine..