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    Hi

    So I came across a question earlier on from Jan 11. It read this:

    'Deduce an equation to show how NO2 reacts with water and oxygen to form nitric acid (HNO3).'

    So it's going to be along the lines of: NO2 + H2O + O2 -> HNO3

    I balanced this out to 2NO2 + H2O + 1/2O2 -> 2HNO3

    The correct answer was 4NO3 + 2H2O + O2 -> 4HNO3 but the MS said accept/allow multiples.

    I know you can use half O2s when balancing combustion reactions, but I was unsure as to whether I can do it here and if you can do it if you only have one O2.

    Any help would be appreciated ^_^
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      (Original post by AdamskiUK)
      Hi

      So I came across a question earlier on from Jan 11. It read this:

      'Deduce an equation to show how NO2 reacts with water and oxygen to form nitric acid (HNO3).'

      So it's going to be along the lines of: NO2 + H2O + O2 -> HNO3

      I balanced this out to 2NO2 + H2O + 1/2O2 -> 2HNO3

      The correct answer was 4NO3 + 2H2O + O2 -> 4HNO3 but the MS said accept/allow multiples.

      I know you can use half O2s when balancing combustion reactions, but I was unsure as to whether I can do it here and if you can do it if you only have one O2.

      Any help would be appreciated ^_^
      Yes, your answer would get you the mark. According to my teacher, 'Multiples' also means factors so that's a perfectly valid response, one which I did myself.
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      (Original post by SomePotential)
      Yes, your answer would get you the mark. According to my teacher, 'Multiples' also means factors so that's a perfectly valid response, one which I did myself.
      Brilliant, ta.
     
     
     
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