<span><span>1) </span><span>K2CO3 + Ca(OH)2 → CaCO3 + 2KOH
2) K2SO4 + Pb(NO3)2 →</span> KNO3 + PbSO4<span>
3) H2SO4 + K2CO3→ </span>K2SO4 + CO2↑газ углекисл + H2O<span>
4) NH4Cl + AgNO3 →</span> AgCl↓ + NH4NO3</span>
Na2SO4 = 142 г/моль
w(Na) = 23*2/142 = 0,3239 = 32,39%
w(S) = 32/142 = 0,225 = 22,5%
w(O) = 16*4/142 = 0,45 = 45%
Ответ: Г..................................
Мг(СnH2n+2)=!2n+2n+2=100 14n=98 n=7 или C7H16
<span>электролиты
NaI, HBr,<span>CaCl2, KOH, H2SO4,
</span>
<span>неэлектролиты
</span></span>O2, CH4,<span><span>C12H22O11</span>
</span>