Question

calculate the number of water molecules present of
in 18 gm of water.​

Answer 1

18g of water contains 6.022×10^23 molecules of water…

One mole is the answer! ;-) Because mole is a defined amount of quantity.

Answer 2

Here,no. Of moles of water in 18g=given weight/molecular weight

=18/18

=1

So,no. Of molecules=avogadro no. ×no. Of moles

=(6.022×10^23)×1

=6.022×10^23 molecules

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