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  4. How many moles of oxygen gas can be produced during electrolytic decomposition of 180 g of water?

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Q. How many moles of oxygen gas can be produced during electrolytic decomposition of $180 \,g$ of water?

Some Basic Concepts of Chemistry

Solution:

$2 H _{2} O \to 2 H _{2}+ O _{2}$

$2 \times 18=36 \,g$

$36\, g$ of water produces $1 \,mol$ of $O _{2}$ gas.

$180\, g$ of water will produce $\frac{180}{36}=5 \,mol$ of $O _{2}$ gas