56.0L of nitrogen gas is mixed with excess of hydrogen gas and it is found that 20L of ammonia gas is produced. The volume of unused nitrogen gas is found to be _______L.

<p><math><mrow><msub><mrow><mi>&nbsp; &nbsp; &nbsp; N</mi></mrow><mrow><mn>2</mn></mrow></msub><mrow><mo> (</mo><mrow><mi>g</mi></mrow><mo>)</mo></mrow><mo>+</mo><mn>3</mn><msub><mrow><mi>H</mi></mrow><mrow><mn>2</mn></mrow></msub><mrow><mo> (</mo><mrow><mi>g</mi></mrow><mo>)</mo></mrow><mo>→</mo><mn>2</mn><mi>N</mi><msub><mrow><mi>H</mi></mrow><mrow><mn>3</mn></mrow></msub><mrow><mo> (</mo><mrow><mi>g</mi></mrow><mo>)</mo></mrow></mrow></math></p><p>t =&nbsp; 0&nbsp;56 <math><mrow><mi mathvariant="script">l</mi></mrow></math>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Excess 0</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-10 <math><mrow><mi mathvariant="script">l</mi></mrow></math>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;+20 <math><mrow><mi mathvariant="script">l</mi></mrow></math></p><p>Final&nbsp;46 <math><mrow><mi mathvariant="script">l</mi></mrow></math>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 20 <math><mrow><mi mathvariant="script">l</mi></mrow></math></p><p>Vol. of N₂ (g) remained unreacted = 46&nbsp;<math><mrow><mi mathvariant="script">l</mi></mrow></math></p>

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