How many atoms are in 49.6 g Se?

3.79 ×10²³ atoms

Explanation:

Given data:

Mass of Se = 49.6 g

Number of atoms = ?

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of selenium is 78.96 g/mol.

by putting values,

Number of  moles = 49.6 g/ 78.96 g/mol.

Number of moles = 0.63 mol

Number of atoms:

Now we will apply Avogadro number.

1 mole contain 6.022×10²³ atoms

0.63 mol ×  6.022×10²³ atoms / 1 mol

3.79 ×10²³ atoms

answer: c.

explanation:

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.