Question

1.How many atoms are in each elemental sample? 3.7 mol Cu express your answer using two significant figures

5.7×10^−3 mol C express your answer using two significant figures

22.6 mol Hg express your answer using three significant figures

0.155 mol Na express your answer using three significant figures

2. How many formula units make up 10.0 g of magnesium chloride (MgCl2)?

3. How many atoms are in each elemental sample? 5.6×10²⁴ Pb atoms Express your answer using two significant figures.

2.02×10²² He atoms Express your answer using three significant figures.

6.46×10²³ K atoms Express your answer using three significant figures.

4.54×10²¹ Ca atoms Express your answer using three significant figures.