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Q.
The oxygen obtained from 72 kg of water is
VMMC MedicalVMMC Medical 2007
Solution:
Key Idea: First-write the reaction for dissociation of water and then with help of unitary method find how much oxygen is produced from 72 kg of water. $ \underset{\begin{smallmatrix} 2(1\times 2+16) \\ =\,36\,\text{kg} \end{smallmatrix}}{\mathop{2{{H}_{2}}O}}\,\xrightarrow{{}}2{{H}_{2}}+\underset{\begin{smallmatrix} 2\,\times \,16 \\ =32\,\text{kg} \end{smallmatrix}}{\mathop{{{O}_{2}}}}\, $ $ \because $ $ 36\text{ kg}\,{{\text{H}}_{2}}O $ produces oxygen $ =32\,\text{kg} $ $ \therefore $ $ \text{72}\,\,\text{kg}\,{{\text{H}}_{\text{2}}}\text{O} $ process oxygen $ =\frac{32}{36}\times 72 $ $ =64\,kg $