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Question

What are the number of moles and the number of H atoms present in 9.033×1023 molecules of water?

A
18.066×1023 atoms, 3 moles
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B
5.419×1024 atoms, 9 moles
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C
24.088×1023 atoms, 4 moles
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D
2.8066×1024 atoms, 3 moles
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Solution

The correct option is A 18.066×1023 atoms, 3 moles
The chemical formula of water is H2O.
One molecule of water contains two hydrogen atoms.
9.033×1023 molecules of water contain: 2×9.033×1023=18.066×1023 atoms of hydrogen.

Number of moles of hydrogen atoms = Number of atomsAvogadro no.=18.066×10236.022×1023 = 3 moles.

One mole of a substance contains Avogadro's number of particles.
Hence, 3 moles of hydrogen atoms contain = 3×6.022×1023 atoms = 18.066×1023 atoms.

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