Question:
$0.1$ mole of a carbohydrate with empirical formula $CH_2O$ contains $1\, g$ of hydrogen. What is its molecular formula ?
$0.1$ mole of a carbohydrate with empirical formula $CH_2O$ contains $1\, g$ of hydrogen. What is its molecular formula ?
Updated On: Jun 23, 2023
- $C_5H_{10}O_5$
- $C_6H_{12}O_6$
- $C_4H_8O_4$
- $C_3H_6O_3$
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The Correct Option is A
Solution and Explanation
$0.1$ mol of carbohydrate with empirical formula $CH_{2}O$ contains $1\, g$ of hydrogen
$\therefore$ $1$ mol of carbohydrate with empirical formula $CH_{2}O$ contains $10 \,g$ of hydrogen $= 10\, g$ atoms
In $CH_{2}O$ atomic ratio of $C : H : O = 1 :2 : 1$ with $10\, g$ atoms of $H, g $ atoms of carbon $= 5$ and $g$ atoms of oxygen $= 5$
$\therefore$ The molecular formula of the carbohydrate is $C_{5}H_{10}O_{5}$
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Some Basic Concepts of Chemistry
Chemistry is a vast subject and for understanding its significance we can take help of following points:
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Classification of Matter
There are two ways of classifying the matter:
(A) Physical Classification:
Matter can exist in three physical states:
- Solids - have definite volume and definite shape
- Liquids - have definite volume but not definite shape.
- Gases - have neither definite volume nor definite shape.
(B) Chemical Classification:
Based upon the composition, matter can be divided into two main types:
- Pure Substances are defined as a single substance (or matter) which cannot be separated by simple physical methods. Pure substances can be further classified as (i) Elements (ii) Compounds
- Mixtures are the combination of two or more elements or compounds which are not chemically combined together and may also be present in any proportion.