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  4. At a given temperature and pressure 64gm of Oxygen and Xgm of H2 occupy the same volume. Then x=....gm

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Q. At a given temperature and pressure 64gm of Oxygen and Xgm of $H_2$ occupy the same volume. Then x=....gm

Thermal Properties of Matter

Solution:

Since they occupy same volume, the two gases should contain same number of molecules, i.e. they have same number of moles.
Now 1 mole of oxygen $=32 gm$.
Hence $64 gm =2 mole$ of oxygen.
$\therefore $ number of moles of hydrogen is $2 .$
1 mole of hydrogen $=2 gm$
Hence $X =4 gm$