What is the molarity of a solution made by dissolving 21.2 g of a sodium hydroxide (naoh) in enough water to make 7.92 l of solution?

Formula for molarity is

Molarity=moles of solvent/solution in liters

In given data

NaOH is 21.2g which is needed to be convert in moles first

As no.of moles=mass in gram/molar mass

Molar mass of NaOH is 39.997g/mol

Putting in formula for mole.we get

No of mole = 21.2g/39.997gper mole

= 0.530mole

Now put these values in molarity equation, we get

Molarity =moles of NaOH/ solution in liter

= 0.530/7.92

=0.067M NaOH

0.067

Explanation:

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

it is the most commonly accepted one