What is the molarity of naoh solution if 30.0g of naoh solid was dissolved in 500.ml of water? (molar mass of naoh is 40.0 g/mol)

The answer to your question is:  1.5 M

Explanation:

Data

MW NaOH = 40 g/mol

mass = 30 g

V = 500 ml

Molarity (M) = ?

number of moles = n

Formula

M = n/V(l)

Process

                        40 g        1 mol

                        30 g         x

                        x = (30)(1)/40

                       x = 0.75 mol

Volume

                     1000 ml  1 l

                       500 ml   x

                        x = (500)(1) / 1000

                        x = 0.5 l

Molarity = 0.75 / 0.5

             = 1.5 M    

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