A) 72 kg
B) 46 kg
C) 50 kg
D) 64 kg
Correct Answer: D
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 \[=\frac{32}{36}\times 72\] \[=64\,kg\]
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