<p>8g of sulphur are burnt to form&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi><msub><mi>O</mi><mn>2</mn></msub></math>&nbsp;which is oxidised by&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;water. The solution is treated with&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>B</mi><mi>a</mi><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub></math>&nbsp;solution. The amount of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>B</mi><mi>a</mi><mi>S</mi><msub><mi>O</mi><mn>4</mn></msub></math>&nbsp;precipitated is:</p>