С-<span>1s </span>2<span>2s </span>2<span>2p </span><span>2
Si - </span><span>1s </span>2<span>2s </span>2<span>2p </span>6<span>3s </span>23p<span>2
Li - </span><span>1s </span>2<span>2s </span><span>1
O - </span><span>1s </span>2<span>2s </span>2<span>2p </span><span>4</span>
Ответ:3,т.к. эти вещества-алканы.общая формула CnH2n+2
2NaOH+H2SO4=NA2SO4+2H2O
n(NaOH)=49/40=1,225 моль
n(H2SO4)=49/98=0,5 моль
n(H2SO4)=n(NA2SO4)
m(Na2SO4)=n*M=0,5*142=71 г
ответ г
1)C2H6+CL2 = C2H5CL+HCL;2)C2H5CL+CH3CL+2Na = 2NaCL+C3H8+смесь изомеров(C2H6+C4H10);3)H3C-CH2-CH3 = H2C=CH-CH3+H24)C3H6+Br2 = C3H6Br2