Question

NEED HELP ASAP!!! really confused. can someone explain how to do it? (Stoichiometry)

Answer 1

Answer:

The answer to your question is below

Explanation:

Data

mass of Gold = 35.12 g

mass number of gold = 197 g (from the periodic table)

1.- To calculate the number of moles use proportions

                            197 g of gold ----------- 1 mol

                            35.12 g of gold --------  x

                              x = (35.12 x 1)/197

                              x = 0.18 moles of gold

2.- To calculate the number of atoms also use proportions and the Avogadro's number.

                            1 mol of gold ------------ 6.023 x 10 ²³ atoms

                           0.18 moles of gold -----   x

                            x = (0.18 x 6.023 x 10²³) / 1

                           x = 1.084 x 10²³ atoms