Ответ:
Объяснение:
K2SO3 + MgCl2 = MgSO3 + 2KCl
1) Na2SO3→2Na + + SO3 2-
2) NaHSO3→Na + + HSO3 -
HSO3 - →H + + SO3 2-
3)Fe2(SO4)3→2Fe 3+ + 3SO4 2-
4)Ca(OH)2 →Ca 2+ + 2OH -
W=n*Ar(элемента)/Mr(вещества) *100%
Mr(Ca(NO3)2)=40+14*2+16*6=164
W(N)=2*14/164*100%=17%
Mr(<span>NaNO3)=23+14+16*3=85</span>
<span>W(N)=1*14/85*100%=16%</span>
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<span>Mr(KNO2)=39+14+16*2=85</span>
<span>W(N)=1*14/85*100%=16%</span>
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<span>Mr(NO2)=14+16*2=46</span>
<span>W(N)=1*14/46*100%=30%</span>
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<span>Mr(NH3)=14+1*3=17</span>
W(N)=1*14/17*100%=82%
Mr(Ca(NH2)2)=40+14*2+1*4=72
W(N)=2*14/72*100%=39%
CaH2 = Ca + H2
H2 + Cl2 = 2HCl
4HCl + MnO2 = Cl2 + MnCl2 + 2H2O
3Cl2 +6KOH = KClO3 + 5KCl + 3H2O
2KClO3 = 2KCl + O2