JEE Main & Advanced Chemistry States of Matter Question Bank Ideal gas equation and Related gas laws

  • question_answer A mixture of \[N{{O}_{2}}\] and \[{{N}_{2}}{{O}_{4}}\] has a vapour density of 38.3 at \[300K\]. What is the number of moles of \[N{{O}_{2}}\] in \[100g\] of the mixture            [Kerala PMT 2004]

    A)                 0.043    

    B)                 4.4

    C)                 3.4         

    D)                 3.86

    E)                 0.437

    Correct Answer: E

    Solution :

               No. of molecules \[=2\times V.d\]                    \[2\times 38.3=76.3\]                    wt. of \[N{{O}_{2}}=x\]                    So that wt. of \[{{N}_{2}}{{O}_{4}}=100-x\]                    Hence, \[\frac{x}{46}+\frac{100-x}{92}=\frac{100}{76.6}=\frac{2x+100-x}{92}=\frac{100}{76.6}\]                                 x = 20.10, no. of mole. of \[N{{O}_{2}}=\frac{20.10}{46}=0.437\]

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