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

  • question_answer Volume of a gas at STP is \[1.12\times {{10}^{-7}}\]cc. Calculate the number of molecules in it                                            [BHU  1997]

    A)                 \[3.01\times {{10}^{20}}\]              

    B)                 \[3.01\times {{10}^{12}}\]

    C)                 \[3.01\times {{10}^{23}}\]              

    D)                 \[3.01\times {{10}^{24}}\]

    Correct Answer: B

    Solution :

               \[\because \]   22400cc of gas at STP has \[6\times {{10}^{23}}\]molecules                                 \[\therefore \]   1.12 \[\times {{10}^{-7}}\] of  gas at STP has \[\frac{6\times {{10}^{23}}\times 1.12\times {{10}^{-7}}}{22400}\] \[=.03\times {{10}^{14}}=3\times {{10}^{12}}\].

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