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  4. The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is

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Q. The number of moles of oxygen obtained by the electrolytic decomposition of $108 \,g$ water is

JIPMERJIPMER 2008Some Basic Concepts of Chemistry

Solution:

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$\because 36 \,g$ of $H _{2} O$ produce $1$ mole of oxygen
$\therefore 108\, g$ of water will produce oxygen
$=\frac{108}{36}=3\, mol$