Ответы и объяснения

2013-09-06T15:09:37+04:00
a)H2S.Mr(H2S)=2+32=34w(H)=2/34=0,05(5%)w(S)=32/34=0,9(90%)
б)H2SO3.Mr(H2SO3)=2+32+16*3=82w(H)=2/82=0.02(2%)w(S)=32/82=0.39(39%)w(O)=64/82=0.78(78%)
в)H2SO4.Mr(H2SO4)=2+32+16*4=98w(H)=2/98=0.02(2%)w(S)=32/98=0.32(32%)w(O)=64/98=0.65(65%)




2013-09-06T17:58:40+04:00
1/   H2S
   1*2 : 32
     1 :16
17 -100%
16 - x%; x=94%.
2/ H2SO3
   2 : 32 :48
   1 : 16 :24
41-100%
16-x%
x=39%.
3/ H2SO4
   2 :32 :64
   1 :16:32
49-100%
16-x%
x=32,65%.