Asample of sodium chloride (nacl) has 15.2 moles. how many atoms of sodium chloride are in the sample?

9.15 x 10²⁴ atoms NaCl

Explanation: solution:

Use the relationship of moles and Avogadro's number

15.2 moles NaCl x 6.022x10²³ atoms NaCl / 1 mole NaCl

=9.15x 10²⁴ atoms NaCl

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!

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