Question

8g of sulphur is burnt to form so2 which is oxidised by cl2 water. The solution is treated with BaCl2 solution. The amount of BaSO4 precipitated is? a. 1 mol b. 0.5 mol c. 0.24 mol d. 0.25 mol

Answer 1

if BaSo4 was precipitated in solution contain 0.012 M NaCl and 0.002 M BaCl2 .calculate the sulfate concentration which is sufficient for saturate the solution with BaSo4 , if you now that the Ksp for BaSo4 equal to 1*10^-10 . 

Answer 2

1mole of S produces 1 mole of BaSO4

Number of moles in 8g of S= 8/32 =0.25  

Thus number of moles of  BaSO4= 0.25