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  4. The number of sodium atoms in 2 moles of sodium ferrocyanide is

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Q. The number of sodium atoms in $ 2 $ moles of sodium ferrocyanide is

UPSEEUPSEE 2012Some Basic Concepts of Chemistry

Solution:

Formula of sodium ferrocyanide $Na _{4}\left[ Fe ( CN )_{6}\right]$ of suggests that it has four sodium atoms.

Number of $Na$ atoms

$=$ Number of moles $\times$ number of atoms per molecule $\times$ Avogadro number

$=2 \times 4 \times 6.023 \times 10^{23}=48 \times 10^{23}$