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9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    Calculate the number of moles of helium present in\[6.46\,\,g\]. (The atomic weight of helium is\[4\,\,a.m.u.\]).

    A)  \[16.15\] moles  

    B)         \[1.615\] moles  

    C)  \[161.5\] moles  

    D)         \[0.1615\] moles

    Correct Answer: B

    Solution :

     Gram atomic weight of\[He=4\,\,g\] Number of moles\[\text{=}\frac{\text{Given}\,\,\text{weight}\,\,\text{of}\,\,\text{element}}{\text{Gramatomic}\,\,\text{weight}}\text{=}\frac{\text{6}\text{.46}}{\text{4}}\]\[=1.615\]moles


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