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Question

One mole of H2O contains moles of hydrogen atoms.

A
one
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B
two
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C
three
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D
four
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Solution

The correct option is B two
A mole is a number just like a dozen or a century. A dozen has 12 things, similarly a mole has 6.023 x 1023 entities (atom, molecule and particles).

1 mole of water contains 6.023 x 1023 H2O molecules.

Each H2O molecule has two H atoms and one O atom. So, 1 mole of water which is 6.023 x 1023 H2O molecules will have

2 x [6.023 x 1023] hydrogen atoms and 6.023 x 1023 oxygen atoms.

So, one mole of water will have two moles of hydrogen atoms and one mole of oxygen atoms.

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