First, we write what Avogadro's number states:
1 mol of Cu = 63.54 g of Cu = 6.02x10^23 atoms of Cu
Now, we proceed like this:
(1 kg = 1000 g) ====> 154 kg = 154,000 g
63.54 g Cu ---------- 6.02x10^23 atoms Cu
154,000 g Cu---------- X
X = 1.46x10^27 atoms Cu
Answer: 1.46x10^27 atoms Cu
