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Question

The number of sodium atoms in 4 moles of sodium ferrocyanide (Na3[Co(NO2)6]) is:
(Consider Avogadro's number = 6×1023)

A
4.32×1023
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B
2.24×1024
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C
9.68×1023
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D
7.2×1024
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Solution

The correct option is D 7.2×1024
We know that three sodium atoms are present in sodium ferrocyanide Na3[Co(NO2)6].
Hence, the total number of Na atoms in 4 moles of Na3[Co(NO2)6]
= number of moles × number of atom × Avogadro's number
=4×3×6×1023=7.2×1024

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