Determine the mass in grams of 3.00 × 10²¹ atoms of arsenic. (the mass of one mole of arsenic is 74.92 g.)

The answer to your question is: 0.373 g

Explanation:

Data

mass = ? g

atoms = 3 x 10 ²¹

AM = 74.92 g

Process

                     1 mol of As  6.023 x 10²³ atoms

                     x                    3 x 10 ²¹  atoms

                     x = 4.98 x 10⁻³ moles

                     1 mol   74.92 g

                     4.98 x 10⁻³ moles     x

                     x = (4.98 x 10⁻³ x 74.92)/1

                     x = 0.373 g of As

The number of atoms present in a mole of elements can be given by the Avagadro number. The value of the Avagadro number has been equal to .

1 mole = atoms

The mass of 1 mole of As is 74.92 grams.

1 mole = 74.92 grams

atoms = 74.92 grams.

The number of atoms of As has been = atoms.

atoms = 74.92 grams.

atoms = grams

atoms = 3.73 grams.

The mass of atoms of Arsenic has been 3.73 grams.

For more information about the mass of atoms, refer to the link:

link

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