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Mole Concept and Avogadro's Number

The molecular...

Question

The molecular weight of $O_{2}$ and $S O_{2}$ are 32 and 64 respectively. If one litre of $O_{2}$ at $15^{\circ} C$ and 750 mm pressure contains 'N' molecules, the number of molecules in two litres of $S O_{2}$ under the same conditions of temperature and pressure will be

A

N/2

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B

N

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C

2N

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D

4N

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Solution

The correct option is C
2N

At same temperature and pressure, equal volumes have equal number of molecules. If 1lit. of oxygen consists N molecules then at same temperature and pressure 1 lit of $S O_{2}$ will consists N molecules. So 2 lit. of $S O_{2}$ will contain 2N molecules.

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