1. Mole Conversions Practice

2. Determine the number of moles of 25.0 g of propylene, C3H8.

3. 25.0 g 1 mole = mol g

4. Determine the number of moles in 5.56 x 1025 atoms of aluminum.

5. 5.56 x 1025 atoms 1 mole 1 6.02 x 1023 atoms = 92.4 mol

6. Determine the formula units in 1.00 g of ammonium nitrate.

7. Ammonium Nitrate = NH4NO3 1. 00 g 1 mol 6. 02 x 1023 formu 1 80
Ammonium Nitrate = NH4NO g 1 mol 6.02 x 1023 formu g 1 mol = 7.53 x 1021 formula units

8. How many molecules are in 67 grams of sulfur trioxide?

9. 67 g 1 mol 6.02 x 1023 molec. 1 80.1 g 1 mol = 5.0 x 1023 molecules

10. How many molecules of ethanol, C2H5OH, are in a 25 L sample if the density of ethanol is 0.792 g/mL?

11. 25 L 1000mL 0.792 g 1 mol 6.02 x 1023 1 1L 1 mL 46.0 g 1 mol = 2.6 x 1026 molecules

12. How many atoms of hydrogen are in 3 moles of NH3?

13. 3 mol NH3 6. 02 x 1023molec. 3 atoms H 1 1 mol 1 molec NH3 = 5
3 mol NH x 1023molec. 3 atoms H 1 1 mol 1 molec NH3 = 5.41 x 1024 atoms H