SATHEE: Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry - Result Question 27

####26. The molecular weight of $O_{2}$ and $S O_{2}$ are 32 and 64 respectively. At $15^{\circ} C$ and $150 m m H g$ pressure, one litre of $O_{2}$ contains ’ $N$ ’ molecules. The number of molecules in two litres of $S O_{2}$ under the same conditions of temperature and pressure will be :

[1990]

(a) $N / 2$

(b) $N$

(d) $4 N$

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Solution:

(c) According to Avogadro’s law “equal volumes of all gases contain equal numbers of molecules under similar conditions of temperature and pressure”. Thus if $1 L$ of one gas contains $N$ molecules, $2 L$ of any gas under the same conditions will contain $2 N$ molecules.

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Some Basic Concepts of Chemistry - Result Question 27

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