1. 0.5 moles of CO2 weighs __________ g .

2. 10 atoms of Al weighs __________ g

3. 0.44 g of CO2 = _______ molecules of CO2

4. 146 g of SF6 contains _________ atoms of F

5. The weight percent of oxygen in CaCO3 is __________ %

6. Four atoms of Ca weigh __________ g

7. 39 cm³ = _______ m³

 8. Underline the significant figures in the number 0.0000450. 

 9. 4.5 g Br₂ = ________ moles

10. 87 g of NaCl = _________ atoms of Na

11. 6x10²¹ molecules of H₂O = _______ grams H₂O