Packing of $N a^{+}$ and $C l^{-}$ ions in sodium chloride is depicted by the given figure. Choose the correct option regarding formula mass of sodium chloride.

In the solid state, sodium chloride does not exist as a single entity.

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Formula mass of NaCl is 68.0 u

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Formula mass of NaCl is the sum of atomic masses of Na and Cl

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Both (a) and (c)

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Solution

The correct option is D Both (a) and (c)
In case of solids like sodium chloride which have crystal lattice, they donot exist as single entity and for such solids formula mass is defined as the sum of the atomic mass of the constituting atoms. For $N a C l$ its formula mass is $23 + 35.5 = 58.5 u$
option D is correct

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Similar questions

Q. Sodium chloride has a crystalline structure made up of

N a^{+}

and

C l^{-}

ions. Why does

N a C l

not conduct electricity in solid state?

Q. (a) Define 'formula unit' of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride ?
(b) Calculate he formula masses of the following compounds :
(i) Calcium chloride
(ii) Sodium carbonate
(Given : Atomic masses : Ca = 40 u ; Cl = 35.5 u ; Na = 23 u ; C = 12 u ; O = 16 u)

Q. Assertion: If

λ_{N a^{+}}^{\circ} + λ_{C l^{-}}^{\circ}

are molar limiting conductivity of the sodium and chloride ions respectively, then the limiting molar conducting for sodium chloride is given by the equation:

λ_{N a C l}^{\circ} = λ_{N a^{+}}^{\circ} + λ_{C l^{-}}^{\circ}

Reason:This is according to Kohlrausch law of independent migration of ions.

Q. When sodium chloride (

NaCl

) is dissolved in water, then

{Na}^{+}

and

{Cl}^{-}

ions are attracted to the atoms of water molecule. Identify the corresponding atoms to which they attract to from the given options.

In our NCERT book, a paragraph is written - Sodium and chloride ions, being oppositely charged, attract each other and are held by strong electrostatic forces of attraction to exist as sodium chloride (NaCl). It should be noted that sodium chloride does not exist as molecules but aggregates of oppositely charged ions.

But I am getting confused in the last line, I.e. NaCl does not exist as molecules but aggregates of oppositely charged ions.

What is meant by this statement??

Please explain very clearly and conceptually.

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Packing of Na+ and Cl− ions in sodium chloride is depicted by the given figure. Choose the correct option regarding formula mass of sodium chloride.

Packing of $N a^{+}$ and $C l^{-}$ ions in sodium chloride is depicted by the given figure. Choose the correct option regarding formula mass of sodium chloride.