Question

molecular mass of water is 18u . what will be the number of molecules of water in 18g water?

Answer 1

Molecular weight of water = 18 g/mol

Given weight = 18 g

So, number of moles n = (Given Weight)÷(Molecular Weight)

So, n = 18/18 = 1 mole


Now, 1 mole of any entity contains
6.022 × 10^23 units of that entity.


So, in 1 mole water, there are 6.022 × 10^23 molecules

Answer 2

Answer:

The molar mass of water is 2 grams for H2 + 16 grams for O = 18 grams ,check the periodic table for respective atomic masses. Avogadro’s number states that any mole of matter contains 6.022*10^23 particles ( atoms or molecules) Therefore 18 grams of water contain 6.022*10^23 molecule

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