Question

The number of sodium atoms in $2$ moles of sodium ferrocyanide is:

• A. $ 12\times {{10}^{23}} $
• B. $ 26\times {{10}^{23}} $
• C. $ 34\times {{10}^{23}} $
• D. $ 48\times {{10}^{23}} $

Answer 1

Answer: (D)

Formula $Na _{4}\left[ Fe ( CN )_{6}\right]$ sodium ferrocyanide suggests that it has four sodium atoms.
Number of $Na$ atoms $=$ no. of moles $\times$ no. of atoms per molecule $\times$ Avogadro number
$=2 \times 4 \times 6: 023 \times 10^{23}$
$=48 \times 10^{23}$