Question

Calculate the number of h atoms present in 18g h2o

Answer 1

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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

Answer 2

We have,


In 1 mole of H2O, no. of H atom = 2.

given weight of H20 = 18 g.

so,no. of moles = 1.

So, no. of moles of H atom = 2.

1 mole = 6.022 × 10²³ atoms.

thus, 2 mole = 12.044 × 10²³ answer.


Regards

KSHITIJ