The molecular mass of water is 18.02 amu. What is the mass of Avogadro’s number of water molecules?

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The molecular mass of water is 18.02 amu. What is the mass of Avogadro’s number of water molecules?

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Answer 1 · 2017-07-09T23:35:27

$18.02$ $18.02$ $g$ $"g"$

Explanation:

This question involves a fundamental concept of the mole:

The mass in $amu$ $"amu"$ of one unit of a substance is equivalent to the mass in $g$ $"g"$ of one mole of that substance

Therefore, if one water molecule has a mass of $18.02$ $18.02$ $amu$ $"amu"$ , one mole ( $6.022 \times 10^{23}$ $6.022 xx 10^23$ $H_{2} O$ $"H"_2"O"$ molecules) of water has a mass of $18.02$ $color(red)(18.02$ $g$ $color(red)("g"$ .

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The molecular mass of water is 18.02 amu. What is the mass of Avogadro’s number of water molecules?

1 Answer

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