Verified answer

Ответ: 2) в сероводороде

1) Na2S

Mr(Na2S)=23×2+32=78

w(S)=(32/78)×100%=41%

2) H2S

Mr(H2S)=2+32=34

w(S)=(32/34)×100%=94%

3) SO2

Mr(SO2)=32+16×2=64

w(S)=(32/64)×100%=50%

4) SO3

Mr(SO3)=32+16×3=80

w(S)=(32/80)×100%=40%

1) Na2S

  Mr(Na2S)=Ar(Na)*n(Na)+Ar(S)*n(S)=23*2+32*1=78

  W(S)=Ar(S)*n(S)*100%/Mr=32*100/78=41%

2) H2S

   Mr=2+32=34

   W=32*100%/34=94%

3) SO2

   Mr=32+32=64

   W=32*100%/64=50%

4) SO3

   Mr=32+48=80

   W=32*100%/80=40%

Ответ: 2