Question

Calculate the no.of atoms in 18g of water(H20). Please show the formula for calculating the no.of atoms .

Answer 1

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Answer 2

To calculate number of particles you need to know number of moles.

As we all know that if we take the molar mass of a substance in grams it becomes equal to its one mole.

So, 18 grams of water means one mole of water.

And we all know that one mole of a substance contains 6.022×10^23 number of particles.

So one mole of water contains 6.022×10^23 number of water molecules.

We know that every water molecule is made up of two hydrogens and one oxygen which means that every water molecule contains 3 atoms.

So, to get number of atoms in 18g of water, we will multiply Avogadro's number by 3.

(6.022×10^23)×3=1.8066×10^24

I hope you get the calculation process and it helps you in your future chemical calculations