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>
<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%