How many atoms are in 8.65 g of H2O with explanation

2.9 x 10^23 atoms

Explanation:

First get the molar mass of water, H2O

(1x2) + 16 = 18g

Recall that based on Avogadro's law, 1 mole of any substance has 6.02 x 10^23 atoms

So if 1 mole of H2O has a molar mass of 18g We can say 18g = 6.02 x 10^23 atoms

Then, 18g = 6.02 x 10^23 atoms

8.65g = Z atoms

To get the value of Z, we cross multiply:

18g x Z atoms= (6.02 x 10^23 atoms) x 8.65g

18Z = 52.07 x 10^23 atoms

Hence, Z = (52.07 x 10^23 atoms) ➗ 18

Z = 2.9 x 10^23 atoms

Thus, there are 2.9 x 10^23 atoms in 8.65 g of H2O

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