What is the mass of a formula unit of ${Na}^{+} {Cl}^{-}$ ( atomic mass of $Na = 23, Cl = 35.5$ )?

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Solution

Mass of one formula unit of $NaCl$ = Atomic mass of $Na$ + atomic mass of $Cl$
$= 23 u + 35.5 u = 58.5 u$
Thus, the formula unit mass of $NaCl$ is $58.5 u$

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Similar questions

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. Calculate the formula mass of compound given below:

NaCl (common salt)

Given: Atomic masses of Na = 23, Cl = 35.5.

Show that the reaction of ammonia and hydrochloric acid to form ammonium chloride is in accordance with the law of conservation of mass. $(N = 14, Cl = 35.5, H = 1)$
${NH}_{3} + HCl ⇌ {NH}_{4} Cl$

Q. How many unit cells are present in a cube-shaped ideal crystal of

N a C l

of mass

1.00 g

[Atomic masses :

N a = 23, C l = 35.5]

How many unit cells are present in a cubic -shaped ideal crystal of NaCl of mass 1.00 g [Atomic masses: Na= 23, Cl = 35.5]

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What is the mass of a formula unit of Na+Cl-( atomic mass of Na=23,Cl=35.5)?

Mass of one formula unit of NaCl= Atomic mass of Na + atomic mass of Cl =23u+35.5u=58.5uThus, the formula unit mass of NaCl is 58.5u

What is the mass of a formula unit of ${Na}^{+} {Cl}^{-}$ ( atomic mass of $Na = 23, Cl = 35.5$ )?

Mass of one formula unit of $NaCl$ = Atomic mass of $Na$ + atomic mass of $Cl$
$= 23 u + 35.5 u = 58.5 u$
Thus, the formula unit mass of $NaCl$ is $58.5 u$