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Punjab Medical Punjab - MET Solved Paper-2004

  • question_answer
    The number of moles of oxygen present in one litre of air under standard conditions (it contains \[21%\] oxygen) is:

    A) \[0.246\,\,mole\]

    B) \[0.07438mole\]

    C) \[2.0078\,\,mole\]

    D) \[0.0093\,\,mole\]

    Correct Answer: D

    Solution :

    Air contains \[21%\] of oxygen \[\therefore \]volume of oxygen\[=\frac{21}{100}=0.21\,\,litre\] \[\therefore \]Number of moles of oxygen present in \[0.21\,\,litre\] at\[NTP=\frac{0.21}{22.4}=0.0093\]


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