the percentage of hydrogen in H2O molecule isa)5.55
b)11.11
c)44.45
d)88.89

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Solution

Atomic weight of hydrogen is 1
Atomic weight of oxygen is 16
Molecular weight of water is (1X2 + 16) =18
So in 18g water hydrogen present 2 g
So in 1g water hydrogen present 2/18 g
So in 100g water hydrogen present (2/18)X100 g= 11.11g

So % of hydrogen in water is b) 11.11.

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