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Hydrated and Anhydrous Substances

Calculate the...

Question

Calculate the formula mass of compound given below:
NaCl (common salt)
Given: Atomic masses of Na = 23, Cl = 35.5.

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Solution

Formula mass or formula unit mass of a substance is the sum of the atomic masses of all atoms in a formula unit of a compound. Formula mass of $N a C l = 23 + 35.5 = 58.5 u$

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Q. Calculate the molarity of

11.7 %

N a C l

in water. The density of the solution is

1.60 g / m L

.
(Given, atomic mass

N a = 23 u, C l = 35.5 u

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Q. Calculate the formula masses of the following compounds:
(a) Sodium oxide, Na₂O
(b) Aluminium oxide, Al₂O₃
(Given: Atomic Masses: Na = 23 u; O = 16 u; Al = 27 u)

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

N a C l

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[Atomic masses :

N a = 23, C l = 35.5]

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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]

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)

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Hydrated and Anhydrous Substances

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