Question:
The maximum number of molecules is present in
The maximum number of molecules is present in
Updated On: Jun 23, 2023
- $15\, L$ of $H_2$ gas at $STP$
- $5\, L$ of $N_2$ gas at $STP$
- $0.5\, g$ of $H_2$ gas
- $10\, g$ of $O_2$ gas
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The Correct Option is A
Solution and Explanation
At $STP$,
$22.4\, L$ of $H_2 = 6.023 \times 10^{23}$ molecules
$15\,L$ of $H_2$ $=\frac{6.023 \times 10^{23} \times15}{22.4}$
$=4.033 \times 10^{23}$ molecules
$5\,L$ of $N_{2}=\frac{6.023 \times10^{23} \times5}{22.4}$
$=1.344\times10^{23}$ molecules
$2\,g$ of $H_{2}=6.023 \times10^{23}$ molecules
$0.5\,g$ of $H_{2}=\frac{6.023 \times10^{23}\times0.5}{2}$
$=1.505\times10^{23}$ molecules
$32\,g$ of $O_{2}=6.023 \times 10^{23}$ molecules
$10\,g$ of $O_{2}=\frac{6.023 \times 10^{23} \times10}{32}$
$=1.882 \times 10^{23}$ molecules
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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.
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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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- 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.