JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer The number of moles of oxygen in \[1\ L\] of air containing 21% oxygen by volume, in standard conditions, is [CBSE PMT 1995; Pb. PMT 2004]

    A)                 0.186 mol             

    B)                 0.21 mol

    C)                 2.10 mol               

    D)                 0.0093 mol

    Correct Answer: D

    Solution :

               1L of air =210cc \[{{O}_{2}}\]                    22400cc = 1 mole                                 \[210\,cc=\frac{1}{22400}\times 210=0.0093\].


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