Question

The molar mass of magnesium (Mg) is 24.30 g/mol. There are 6.02 1023 atoms in 1 mol. How many atoms are present in 48.60 g of Mg? 3.32 10–24 atoms 1.96 10–21 atoms 1.20 1024 atoms 7.11 1026 atoms

Answer 1

Simply, letter C.

Answer 2

1.2 x 10²⁴atoms

Step-by-step explanation:

Given parameters:

Molar mass of Mg = 24.3g/mol

Mass of Mg = 48.6g

Number of atoms in 1 mole = 6.02 x 10²³ atoms

Solution

We know that

1 mole contains 6.02 x 10²³ atoms

Now we have to find the number of moles that are in the given mass of the magnesium atom.

Number of moles =
`(mass)/(molar mass)`

Number of moles =
`(48.6)/(24.3)` = 2mole

Now 2 moles of Mg will contain 2x 6.02 x 10²³ atoms = 1.2 x 10²⁴atoms