\(a,n_{C_2H_4}=\dfrac{30,9875}{24,79}=1,25\left(mol\right)\)
PTHH: C2H4 + 3O2 --to--> 2CO2 + 2H2O
1,25--->3,75
b, \(V_{O_2}=3,75.24,79=92,9625\left(l\right)\)
c, PTHH: C2H4 + H2O --axit--> C2H5OH
1,25--------------------->1,25
\(\Rightarrow m_{C_2H_5OH}=1,25.80\%.46=46\left(g\right)\)