\(n_{C_2H_2}=\dfrac{13}{26}=0,5\left(mol\right)\\ PTHH:2C_2H_2+5O_2\rightarrow\left(t^o\right)4CO_2+2H_2O\\ CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3\downarrow+H_2O\\ n_{O_2}=\dfrac{5}{2}.0,5=1,25\left(mol\right)\\ V_{O_2\left(đktc\right)}=1,25.22,4=28\left(l\right)\\ a,V_{kk}=\dfrac{100}{20}.V_{O_2\left(đktc\right)}=5.28=140\left(l\right)\\ b,n_{CaCO_3}=n_{CO_2}=\dfrac{4}{2}.0,5=1\left(mol\right)\\ m_{k.tủa}=m_{CaCO_3}=100.1=100\left(g\right)\)
\(a.C_2H_2+\dfrac{5}{2}O_2-t^{^{ }0}->2CO_2+H_2O\\ V_{KK}=\dfrac{\dfrac{13}{26}\cdot\dfrac{5}{2}\cdot22,4}{0,2}=140\left(L\right)\\ CO_2+Ca\left(OH\right)_2->CaCO_3+H_2O\\ m_{KT}=100\cdot0,5\cdot2=100g\)