СaC2+2H2O=Ca(OH)2+C2H2
C2H2+HCl=C2H3Cl
w=12.5*100/80=15.6
15.6*26/62.5=6.5
w=6.5*80/100=5.2
5.2*64/26=12.8
12.8-100%
x-80%
x=10.24г