Which of the following contains the maximum number of atoms?

  • A
    $16 \, g \, O_2$
  • B
    $14 \, g \, N_2$
  • C
    $2 \, g \, H_2$
  • D
    $6 \, g \, I_2$

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Which of the following substances consists of a total of $1 \ mol$ of atoms? (Molar mass of $NH_3 = 17 \ g/mol, H_2O = 18 \ g/mol, N_2 = 28 \ g/mol, CO_2 = 44 \ g/mol$)

Explain: Avogadro's Law.

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Calculate the number of $Ca^{2+}$ ions in $222 \ g$ of anhydrous calcium chloride $(CaCl_2)$? (Atomic mass: $Ca = 40 \ u$,$Cl = 35.5 \ u$)

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