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  4. The oxygen obtained from 72 kg of water is:

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Q. The oxygen obtained from $72\,kg$ of water is:

Rajasthan PMTRajasthan PMT 2005

Solution:

The oxygen obtained from $72 kg$ of water is obtained by the following equation.
$\underset{\overset{2(2+16)}{=36}}{2 H _{2} O} \longrightarrow \underset{\overset{(2\times 16)}{=32}}{2 H _{2}+ O _{2}}$
Therefore, $36\, kg$ of water produce $32\, g$ of oxygen.
Hence, $72\, kg$ of water produce oxygen
$=\frac{32 \times 72}{36}=64\, kg$