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BVP Medical BVP Medical Solved Paper-2013

  • question_answer
    One mole of ethanol when burnt in oxygen, gives out a: kJ \[mo{{l}^{-1}}\] heat. If one mole of \[{{O}_{2}}\] is used, what will be the amount of heat evolved?

    A)  \[x\,kJ\]                             

    B)  \[\frac{x}{3}\,kJ\]  

    C)  \[3x\,kJ\]                           

    D)  \[\frac{3x}{2}\,kJ\]

    Correct Answer: B

    Solution :

                    \[{{C}_{2}}{{H}_{5}}OH+3{{O}_{2}}\xrightarrow{{}}2C{{O}_{2}}+3{{H}_{2}}O;\Delta H=-xkJ\] By burning with 3 moles of \[{{O}_{2}}\] heat evolved \[=-xkJ\] \[\therefore \]by burning with 1 mole of \[{{O}_{2}}\] heat evolved \[=-\frac{x}{3}kJ\]


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