How many moles are in 4.1 x10 22 molecules of NaCl?

Explanation:

To convert from molecules to moles, Avogadro's Number must be used. This number is 6.022 *10²³. It tells us the number of particles (atoms, molecules, etc.) in 1 mole of a substance.

In this case, the particles are molecules of sodium chloride. We can make a ratio.

Multiply by the given number of molecules.

Flip the fraction so the moles of sodium chloride cancel.

The original measurement of molecules has 2 significant figures, so our answer must have the same. For the number we calculated that is the thousandth place.

The 0 in the ten thousandth place tells us to leave the 8.

There are 0.068 moles of sodium chloride.

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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