Some Basic Concepts of Chemistry - Result Question 1
####1. Which one of the followings has maximum number of atoms?
[2020]
(a) $1 g$ of $Mg(s)$ [Atomic mass of $Mg=24$ ]
(b) $1 g$ of $O_2(g)$ [Atomic mass of $O=16$ ]
(c) $1 g$ of $Li(s)$ [Atomic mass of $Li=7$ ]
(d) $1 g$ of $Ag(s)$ [Atomic mass of $Ag=108$ ]
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Solution:
- (c) Number of atoms
$=\frac{W}{\text{ Molar mass }} \times N_A \times$ atomicity
(a) Number of Mg atoms $=\frac{1}{24} \times N_A \times 1$
(b) Number of $O$ atoms $=\frac{1}{32} \times N_A \times 2$
(c) Number of Li atoms $=\frac{1}{7} \times N_A \times 1$
(d) Number of Ag atoms $=\frac{1}{108} \times N_A \times 1$
(c) $N_2+3 H_2 \longrightarrow 2 NH_3$
$1 Mol NH_3=\frac{3}{2} mol H_2$
$20 mol NH_3=\frac{3}{2} \times 20 mol H_2=30 mol H_2$
