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  4. How many moles of Na+ ions are in 20 ml of 0.4 M Na3PO4 ?

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Q. How many moles of $Na^{+}$ ions are in 20 ml of 0.4 M $Na_{3}PO_{4}$ ?

NTA AbhyasNTA Abhyas 2020Some Basic Concepts of Chemistry

Solution:

$M=\frac{n}{V}\times 1000$

$n=\frac{N u m b e r \, o f \, a t o m s \times M \times V}{1000}$

Number of moles of $Na^{+}=0.4\times 20\times 3\times 10^{- 3}=0.024$