$1.78\, g$ of an optically active L-amino acid $(A)$ is treated with $NaNO_2/HCl$ at $0\,^\circ\,C$. $448\, cm^3$ of nitrogen was at $STP$ is evolved. A sample of protein has $0.25\%$ of this amino acid by mass. The molar mass of the protein is
- $34,500 \,g \,mol^{-1}$
- $34,600 \,g \,mol^{-1}$
- $36,500 \,g \,mol ^{-1}$
- $35,600\, g\, mol ^{-1}$
The Correct Option is D
Solution and Explanation
Molar mass of L-amino acid $=\frac{1.78 \times 22400}{448}$
$=89$
$\because$ Protein has $0.25 \%$ of amino acid by mass
$\therefore$ Molar mass of protein $=\frac{89 \times 100}{0.25}$
$=35600\, g\, mol ^{-1}$
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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:
- Chemistry plays an important role in understanding various subjects like physics, geology and biology.
- Chemistry is a core branch of science that explains us about the various compositional properties and interaction of matter. It also helps to understand various chemical reactions.
- 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.
Read More: Some Basic Concepts of Chemistry
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.