Question

What is mole concept calculate the number of molecules in 45g of water answaer?

Answer 1

Now we calculate the number of molecules in 45 g of water.
Mass of water = 45 g
Molecular mass of oxygen = 16 g
Molecular mass of hydrogen = 2 g
So,
Molecular mass of water = 16 + 2 = 18 g
Number of molecules on 45g of water = ?
Since,
Number of moles of water = Mass of water / Molecular mass of water
Number of moles of water = 45 / 18
Number of moles of water = 2.5 moles
which is the required answer.
Hope it helps. Thanks.

Answer 2

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