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Molecular Mass

What is the f...

Question

What is the formula unit mass of sodium chloride?

A

58.5

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B

35.5

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C

23

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D

40

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Solution

The correct option is A 58.5
The formula of sodium chloride is $N a C l$
Atomic weight of sodium $(N a)$ is $23 g / m o l$
Atomic weight of chloride $(C l)$ is $35.45 g / m o l$
Therefore, the formula unit mass of sodium chloride $(N a C l)$ is $23 + 35.45 = 58.45 g / m o l$ which nearly equals to $58.5 g / m o l$
Hence, option $A$ is correct.

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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)

A unit cell of sodium chloride has four formula units. The edge length of the unit cell is $0.564 n m$ . What is the density of sodium chloride?

Q. A unit cell of sodium chloride has four formula units. The edge length of the unit cell is 0.564 nm. What is the density of sodium chloride?

Q. A unit cell of sodium chloride has four formula units. The edge of length of the unit cell is

0.564

nm. What is the density (in g/cc) of sodium chloride?

Q. A unit cell of sodium chloride has four formula units. The edge length of the unit cell is

0.564

nm. What is the density of sodium chloride?

[N a = 23, C l = 35.5]

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