Q. Which of the following contains largest number of atoms

Solution:

$18\, g$ of $H _{2}=6.022 \times 10^{-23} \times 18$ atoms $=108.36 \times 10^{-23}$ atoms

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9. One atom of an element weighs $ 1.8\times 10^{-22}g$ . Its atomic mass is

Manipal 2009 Some Basic Concepts of Chemistry