In which of the following formula mass is preffered over molecular mass? Water Sodium chloride Methane Ammonia

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What are the molecular formulae of the following compounds?

(Hydrochloric acid, Sulphuric acid, Sodium chloride, Glucose, Methane)

Q. What is the formula mass of sodium chloride?

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)

Which of the following reactions are exothermic in nature?

(i) Evaporation of water
(ii) Dissolution of sodium hydroxide in water
(iii) Dilution of sulphuric acid
(iv) Dissolution of ammonium chloride in water
(v) Combustion of methane gas

Which of the following compound is an example of expanded octet?

A Methane

B Sulphuric acid

C Ammonia

D Aluminum chloride

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