CH3COONA -> CH4 -> C2H2 -> CH2=CH-Cl -> PVC
1,$CH_3COONa + NaOH \xrightarrow[]{CaO,t^o} CH_4 + Na_2CO3$
2,$2CH_4 \xrightarrow[]{1500t^o,LLN} C_2H_2 + 3H_2$
3,$CH≡CH$ + $HCl$ ${\rightarrow}$ $CH_2=CH-Cl$
4,$nCH_2=CH-Cl$ $\xrightarrow[p]{t^o,xt}$$(\kern-6pt- CH_2-CH -\kern-6pt)_n$
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$Cl$
$M_{o}$=$[60kg-70kg)$
$M_{e}$=$65$
$\overline{x}$=$\frac{4.45+6.55+9.65+1.75+1.85}{21}$≈$59,76$
$s^{2}$=$\frac{1}{n}$[$n_{1}$($c_{1}$-$\overline{x}$)$^{2}$+$n_{2}$($c_{2}$-$\overline{x}$)$^{2}$+....+$n_{k}$($c_{k}$-$\overline{x}$)$^{2}$]
=$\frac{1}{21}$[$4$($45-59,76$)$^{2}$+$6$($55-59,76$)$^{2}$+$9$($65-59,76$)$^{2}$+$1$($75-59,76$)$^{2}$+$4$($85-59,76$)$^{2}$≈$101,13$
