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Percentage Composition

Some Basic Concepts of Chemistry
Chemistry
Class 11

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Molecular Composition

ExampleDefinitionsFormulaes

Empirical Formula and Molecular Formula

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Related questions

The chemical formula of magnesium sulphate is:

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Write down the formulae of aluminium chloride.

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A sample of a hydrate of barium chloride weighing 61 g was heated until all the water of hydration is removed. The dried sample weighed 52 g. The formula of the hydrated salt is : (atomic mass, Ba = 137 amu, Cl = 35.5 amu) 

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An organic compound (A) contains C=%, H=% and N=%. On reduction, it gives a primary amine (B) which gives ethyl alcohol with nitrous acid. (B) gives an offensive odour on warming with and KOH and gives compound (C) which on reduction forms ethyl methyl amine. Assign the structures of (A), (B) and (C).

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Two elements A (At. mass - 75) and B (At. mass = 16) combine to yield a compound. The % by mass of A in the compound was found to be 75.08. The formula of the compound is:

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An organic compound on analysis gave , by mass. Its empirical formula is :

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The phosphate of a metal has the formula . The formula of its chloride would be :

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Pheromones are compounds secreted by the females of many insect species to attract males. One of these compounds contains , and . A solution of fo this substance in of benzene freezes at . What are the molecular weight and molecular formula of the compound?


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The number of atoms of Cr and O are and respectively. Its empirical formula is?

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An oxide of a metal (M) contains % by mass of oxygen. Metal (M) has atomic mass of .The empirical formula of the oxide is :

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