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Answer:

[tex]22.4 \: {dm}^{3} \: are \: occupied \: by \: 1 \: mole \\ 12 \: {dm}^{3} \: will \: be \: occupied \: by \: ( \frac{12}{22.4} ) \: moles \\ = 0.536 \: moles[/tex]

Number of moles of water molecules in 12 dm^3 of water =667 moles

What is mole ?

A mole is defined as the amount of a substance that contain exactly 6.022 * 10 ^23 elementary entities of the given substance

1 dm ^3 = 1 L

12 dm^3 = 12 L

density of water = mass / volume

             mass = 1000kg/m^3 * 0.012 m^3

             mass = 12 kg = 12 * 10 ^ 3 g

moles = mass / molar mass

moles =  12 * 10 ^ (3 ) g / 18 g/mole

          = 0.667 *10 ^ (3 )

          = 667 moles

Number of moles of water molecules in 12 dm^3 of water =667 moles

learn more about moles

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