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

there is none because earth is stationary and flat.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72