Question

Sodium is an alkali metal that reacts violently with water. Calculate the total number of atoms in a 58.2 grams sample of sodium and express in correct scientific notation.

Answer 1

In 58.2 grams of Na there is 1.51 x 10^24 atoms.

Mole calculation

To calculate the amount of atoms present in a mass sample, it is necessary to have knowledge of the molar mass of the element and Avogadro's constant, used in such a way that:

$MM_Na= 23g/mol$

$C = 6\times 10^{23}$

                                       $MM = \frac{m}{mol}$

                                    $23 = \frac{58.2}{x} = > 2.53 atoms$

Now, with the value of the number of moles, just calculate the number of atoms present, so that:

                                       $atoms = mol \times C$

                                     $atoms = 2.53 \times 6 \times 10^{23}$

                                        $atoms = 1.51 \times 10^{24}$

So, in 58.2 grams of Na there is 1.51 x 10^24 atoms.

Learn more about mole calculation in: brainly.com/question/2845237