Question #0fc8e

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Question #0fc8e

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Answer 1 · 2017-07-01T13:42:30

$3$ $3$ atoms.

Explanation:

As its chemical formula suggests, a molecule of water contains

two atoms of hydrogen, $2 \times H$ $2 xx "H"$

one atom of oxygen, $1 \times O$ $1 xx "O"$

This means that a single molecule of water contains a total of $3$ $3$ atoms.

${no. of atoms in H}_{2} O = 2 atoms of H + 1 atom of O$ $"no. of atoms in H"_2"O" = "2 atoms of H + 1 atom of O"$

${no. of atoms in H}_{2} O = 3 atoms$ $"no. of atoms in H"_2"O" = "3 atoms"$

![https://www.dreamstime.com/stock-photography-molecule-water-h2o-image6468242]()

So remember, we use subscripts to denote the number of atoms of each element present in a given compound. Keep in mind that we do not add a subscript of $1$ $1$ when dealing with a single atom.

So in this case, two atoms of hydrogen are shown by adding a subscript of $2$ $2$ after $H$ $"H"$ . The single atom of oxygen is shown by adding the chemical symbol of oxygen without a subscript of $1$ $1$ .

So instead of

$H_{2} O_{1}$ $"H"_2"O"_1$

we have

$H_{2} O$ $"H"_2"O"$

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