`a)` `\overline{v}=-1/{2}.{\Delta C_{H_2S}}/{\Delta t}=-1/{3}.{\Delta C_{O_2}}/{\Delta t}=1/{2}.{\Delta C_{SO_2}}/{\Delta t}=1/{2}.{\Delta C_{H_2O}}/{\Delta t}`

`b)`

`n_{SO_2}={0,768}/{64}=0,012(mol)`

`\overline{v}=1/{2}.{0,012}/{2}=0,003(mol//h)`

`c)`

`n_{H_2S\ bd}={0,9916}/{24,79}=0,04(mol)`

`n_{O_2\ bd}={0,7437}/{24,79}=0,03(mol)`

Theo PT: `n_{H_2S\ pu}=n_{SO_2}=0,012(mol)`

`->n_{H_2S\ spu}=0,04-0,012=0,028(mol)`

Theo PT: `n_{O_2\ pu}=3/2n_{SO_2}=0,018(mol)`

`->n_{H_2S\ spu}=0,03-0,018=0,012(mol)`