Question

carbohydrate are compounds containing only carbon, hydrogen,oxygen. when heated in the absence of air, these compound decompose to form carbon and water . if 310 g of a carbohydrate leave a residue of 124g of carbon on heating in absence of air what is the empirical formula of the carbohydrate . ( hint ans CH2O )​

Answer 1

Hey Dear,

◆ Answer -

CH2O

◆ Explanation -

Decomposition of carbohydrate takes place as -

Carbohydrate --> C + H2O

Given that mass of C residue is 124 g.

Moles of C residue -

n(C) = 124/12

n(C) = 10.33 mol

Mass of H2O formed is 310-124 = 186 g

Moles of H2O formed are -

n(H2O) = 186/18

n(H2O) = 10.33 mol

Ratio of moles of C formed is same as that of moles of H2O. Hence, empirical formula of compound would consist one unit of each. i.e. CH2O.

Thanks dear.

Answer 2

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