Question:
A gaseous hydrocarbon gives upon combustion $0.72\, g$ of water and $3.08\, g$ of $CO_2$. The empirical formula of the hydrocarbon is
A gaseous hydrocarbon gives upon combustion $0.72\, g$ of water and $3.08\, g$ of $CO_2$. The empirical formula of the hydrocarbon is
Updated On: Sep 30, 2024
- $C_2H_4$
- $C_3H_4$
- $C_6H_5$
- $C_7H_8$
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The Correct Option is D
Solution and Explanation
18 g $H_2O$ contains $2g H$
$ \therefore 0.72 \, g \, H_2O$ contains $0.08 \, g \, H$
$44 \, g \, CO_2$, contains $12 \, g \, C$
$ \therefore 3.08 \, g\, CO_2$ contains $0.84 \, g \, C$
$ \therefore \, \, \, \, \, \, \, \, C: H = \frac {0.84}{12}: \frac {0.08}{1}$
$ \, \, \, \, \, = 0.07 : 0.08 = 7:8 $
$ \therefore$ Empirical formula $= C_7H_8$
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- Chemistry is important in order to understand the behaviour of fertilizers, alkenes, acids, salts, dyes, polymers, drugs, soaps and alloys in organic and inorganic chemistry.
- Chemistry plays an important role in various fields like healthcare, industrial, research, food, and farm activities.
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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:
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