2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ

JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank The mole concept

  • question_answer
    19.7 kg of gold was recovered from a smuggler. How many atoms of gold were recovered (Au =197)   [Pb. CET 1985]

    A)                 100        

    B)                 \[6.02\times {{10}^{23}}\]

    C)                 \[6.02\times {{10}^{24}}\]              

    D)                 \[6.02\times {{10}^{25}}\]

    Correct Answer: D

    Solution :

               Amount of gold\[=19.7kg\]\[=19.7\times 1000gm\]=19700gm                        No. of moles \[=\frac{19700}{197}=100\]                    \[\therefore \]  No. of atoms \[=100\times 6.023\times {{10}^{23}}\]                                                                               \[=6.023\times {{10}^{25}}\]atoms.


You need to login to perform this action.
You will be redirected in 3 sec spinner