Calculate the number of atoms in $0.02$ mole of carbon.

  • A
    $1.204 \times 10^{22}$ atoms
  • B
    $6.022 \times 10^{23}$ atoms
  • C
    $3.011 \times 10^{22}$ atoms
  • D
    $2.408 \times 10^{22}$ atoms

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Which amongst the following has a greater number of atoms,$11.5 \, g$ of sodium $(Na)$ or $15 \, g$ of calcium $(Ca)$? How? (Given: atomic mass of $Na = 23 \, u$,$Ca = 40 \, u$)

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Define mole. Give its symbol. What is the advantage of this mole concept?

The chemical symbol for sodium is

$(i)$ $(a)$ What do you understand by $1 \text{ amu}$ or $1 \text{ u}$?
$(b)$ How is it linked with relative atomic mass?
$(ii)$ How do we know the presence of atoms if they do not exist independently for most of the elements?

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