SATHEE: Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry - Result Question 1

####1. Which one of the followings has maximum number of atoms?

[2020]

(a) $1 g$ of $M g (s)$ [Atomic mass of $M g = 24$ ]

(b) $1 g$ of $O_{2} (g)$ [Atomic mass of $O = 16$ ]

(d) $1 g$ of $A g (s)$ [Atomic mass of $A g = 108$ ]

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Solution:

$= \frac{W}{Molar mass} \times N_{A} \times$ atomicity

(a) Number of Mg atoms $= \frac{1}{24} \times N_{A} \times 1$

(b) Number of $O$ atoms $= \frac{1}{32} \times N_{A} \times 2$

(d) Number of Ag atoms $= \frac{1}{108} \times N_{A} \times 1$

$1 M o l N H_{3} = \frac{3}{2} m o l H_{2}$

$20 m o l N H_{3} = \frac{3}{2} \times 20 m o l H_{2} = 30 m o l H_{2}$

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Some Basic Concepts of Chemistry - Result Question 1

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