What is the molarity of a solution made by dissolving 25.0 grams of NaCl in 250.0 mL of solution

Molarity= 1.7M

Explanation:

n= m/M = 25/58.5= 0.427mol

Applying

n=CV

0.427= C×0.25

C= 1.7M

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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