Ответ:

а) W(K)=52.3%, W(Cl)=47.6%. б) W(N)=36.8%, W(O)=63.1%.

Объяснение:

1) KCl. M(KCl)=39+35.5=74.5г/моль.

W(K)=M(K)/M(KCl)=39:74.5=0.523*100%=52.3%.

W(Cl)=M(Cl)/M(KCl)=35.5:74.5=0.476*100%=47.6%.

2) N2O3. M(N2O3)=14*2+16*3=76г/моль.

W(N)=M(N)/M(N2O3)=14*2/76=0.368*100%=36.8%

W(O)=M(O)/M(N2O3)=16*3/76=0.631*100%=63.1%.