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

  • question_answer A gaseous mixture contains \[C{{H}_{4}}\]and \[{{C}_{2}}{{H}_{6}}\]in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is

    A)                 4.6 g      

    B)                 1.6 g

    C)                 2.3 g      

    D)                 23 g

    Correct Answer: C

    Solution :

               Equimolecular proportion means both gases occupied equal volume \[=\frac{2.24}{2}=1.12L\]                    For \[C{{H}_{4}}\]:                    22.4L \[C{{H}_{4}}\]has mass \[=16gm\]                    1.12L \[C{{H}_{4}}\]has mass \[=\frac{16}{22.4}\times 1.12=0.8gm\].                    For \[{{C}_{2}}{{H}_{6}}\]                    22.4L \[{{C}_{2}}{{H}_{6}}\]has mass = 30gm                    1.12L\[{{C}_{2}}{{H}_{6}}\]has mass \[=\frac{30}{22.4}\times 1.12\]\[=\frac{3.0}{2}gm=1.5gm\]                                 Total mass \[=1.5gm+0.8gm=2.3gm\].


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