Blog

Question 1

4. How many atoms are present in 4.55 mol of Fe?
5. How many atoms are present in 0.0665 mol of K?
6. How many molecules are present in 2.509 mol of H2_S?
7. How many molecules are present in 0.336 mol of acetylene (C₂H₂)?
8. How many moles are present in 3.55 × 1024 Pb atoms?
9. How many moles are present in 2.09 × 1022 Ti atoms?
10. How many moles are present in 1.00 × 1023 PF₃molecules?
11. How many moles are present in 5.52 × 1025 penicillin molecules?

Question 2

Determine the molar mass of each substance.

1. Si
2. SiH₄
3. K₂O
4. Cl₂
5. SeCl₂
6. Ca(C₂H₃O₂)₂

Question 3

What is the mass of 4.44 mol of Rb?

What is the mass of 0.311 mol of Xe?

What is the mass of 12.34 mol of Fe₂(SO₄)₃?

What is the mass of 0.0656 mol of PbCl₂?

Question 4

How many moles are present in 45.6 g of CO?

How many moles are present in 0.00339 g of LiF?

How many moles are present in 1.223 g of SF₆?

How many moles are present in 48.8 g of BaCO₃?

Question 5 

How many moles are present in 54.8 mL of mercury if the density of mercury is 13.6 g/mL?

How many moles are present in 56.83 mL of O₂ if the density of O₂ is 0.00133 g/mL?