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Question

What is the mass percentage of hydrogen in the H2O molecule?


A

5.55%

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B

11.11%

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C

33.33%

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D

22.22%

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Solution

The correct option is B

11.11%


Let us consider 1 molecule of H2O

Mass of hydrogen in 1 molecule of H2O = 2g

Mass of oxygen in 1 molecule of H2O = 16g

Therefore, total mass of 1 molecule of H2O = 2+16 = 18 g

Now percentage of hydrogen is given by:

= Mass of hydrogen in 1 molecule of H2OTotal mass of 1 molecule of H2O

= 218×100=11.11%


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