## Introductory Chemistry (5th Edition)

There are $1.3 \times 10^{27}$ atoms of Cu
Number of mole = $\frac{mass}{molar mass} = \frac{133 \times 10^{3}}{63.5} = 2094.45$ moles 1 mole = $6.022 \times 10^{23}$ atoms number of atoms = (number of moles) $\times (6.022 \times 10^{23})$ = $(2094.45) \times (6.022 \times 10^{23})$ = $1.3 \times 10^{27}$ atoms Therefore there are $1.3 \times 10^{27}$ atoms of Cu