Question -What is the mass percentage of hydrogen in the H2O molecule?
Options:
A .  5.55%
B .  11.11%
C .  33.33%
D .  22.22%
Answer: Option B : B 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 = 18g Now percentage of hydrogen is given by: =Mass of hydrogen in 1 molecule ofH2OTotal mass of 1 molecule ofH2O =218×100=11.11%
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