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:

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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