<p>When 22.4 litres of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mi>H</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>&nbsp;is mixed with 11.2 litres of&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>C</mi><msub><mi>l</mi><mn>2</mn></msub><mo>(</mo><mi>g</mi><mo>)</mo></math>, each at STP, the moles of HCl(g) formed is equal to:</p>