    Question

# A compound contains equal masses of the elements A, B & C. If the gram atomic masses of A, B & C are 60 g, 20 g & 40 g respectively. Determine the molecular formula of the compound if the molecular mass is 720 g.

A
A3B2C
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B
AB2C3
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C
A4B12C6
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D
A6B3C2
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Solution

## The correct option is C A4B12C6Let individual mass of A, B & C be x gm Mass Ratio is A:B:C ⇒ x:x:x Mole Ratio is A:B:C ⇒ x60:x20:x40 On simplification it becomes 2:6:3 ∴Empirical Formula becomes A2B6C3 Hence empirical formula mass = 2×60+6×20+3×40=360 g We know that Molecular Formula = Empirical Formula×n where, n = Molecular MassEmpirical Mass = 720360 = 2 ∴ Molecular Formula = (A2B6C3)2 i.e. A4B12C6  Suggest Corrections  0      Similar questions
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