SATHEE: Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry - Result Question 17

####17. The maximum number of molecules is present in

(a) $15 L^{2}$ of $H_{2}$ gas at STP

[2004] (c) $0.5 g$ of $H_{2}$ gas

(d) $10 g$ of $O_{2}$ gas

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Solution:

(a) No. of molecules in different cases

(a) $∵ 22.4$ litre at STP contains

$= 6.023 \times 10^{23}$ molecule of $H_{2}$

$∴ 15$ litreat STP contains $= \frac{15}{22.4} \times 6.023 \times 10^{23}$

(b) $∵ 22.4$ litre at STP contains

$= 6.023 \times 10^{23}$ molecule of $N_{2}$

$∴ 5$ litre at STP contians $= \frac{5}{22.4} \times 6.023 \times 10^{23}$

$∴ 0.5 g_{o f} H_{2} = \frac{0.5}{2} \times 6.023 \times 10^{23}$

$= \frac{10}{32} \times 6.023 \times 10^{23} molecules$

Thus (a) will have maximum number of molecules

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Some Basic Concepts of Chemistry - Result Question 17

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