<p>Compound&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>S</mi><mn>4</mn></msub><msub><mi>N</mi><mn>4</mn></msub></math>&nbsp;decompose completely into&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>S</mi><mi>X</mi></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;and&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>N</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>. If all measurements are made of same P and T each volume of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>S</mi><mn>4</mn></msub><msub><mi>N</mi><mn>4</mn></msub></math>&nbsp;gives 4.0 volume of gaeous product. The value of X is........</p>