Question

A sample of gold (Au) has a mass of 35.12 g.

a.
Calculate the number of moles of gold (Au) in the sample and record in
Table 1. Show your work.


b.
Calculate the number of atoms of gold (Au) in the sample and record in Table 1. Show your work

Answer 1

a) 0.1783 mol

b) 1.07*10^23 atoms

Step-by-step explanation:

Step 1: Data given

Mass of gold (Au) = 35.12 grams

Molar mass of gold (Au) = 196.97 g/mol

Number of Avogadro = 6.022 *10^23 /mol

Step 2: Calculate number of moles gold

Number of moles = Mass of gold / molar mass of golf

Number of moles = 35.12 grams / 196.97 g/mol

Number of moles = 0.1783 moles

Step 3: Calculate number of atoms of gold

Number of atoms = number of moles * Number of Avogadro

Number of atoms = 0.1783 * 6.022 *10^23/ mol

Number of atoms = 1.07*10^23 atoms