s Sample papers for JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Topic Test - Some Basic Concepts of Chemistry - Studyadda.com
  2. Sample Papers
  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 Sample Paper Topic Test - Some Basic Concepts of Chemistry

  • question_answer
    What is the atomic weight of an element X for which a sample containing \[1.58\times {{10}^{22}}\] atoms weigh 1.05 g?

    A) 28 g

    B) 20 g

    C) 40 g

    D) 23 g

    Correct Answer: C

    Solution :

    [c] We know that, one mole of an element \[=6.02\times {{10}^{23}}\] atoms
    = Atomic weight of the element
    Now, \[1.58\times {{10}^{22}}\] atoms weigh 1.05 g
    \[\therefore \] \[6.02\times {{10}^{23}}\] atoms weigh    
    \[=\frac{(1.05\times 6.02\times {{10}^{23}})}{1.58\times {{10}^{22}}}\]           
    = 40 g
    Atomic weight of \[X=40g\]


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