Mol Review – Answers

1. 6 H, 4C, 4O

2. 6.02 x 10 ²³ atoms Na

3. 1.20 x 10²⁴ molecules CO2

4. 5.42 x 10²⁴  atoms of H

5. 207.2 g

6. 6.62x10² g

7. 4.15 x 10 ² mol Zn

8.  96.3 g S

8   1.66 x 10^-15 mol

9.  2.06 x 10² g

10.  7.48 x 10 ² g

11.  2.66 x 10^-23 g

12.  5.53 x 10²³ atoms H

Empirical

1. 27.3% C

2. P₂O₅

3. P₈O₂₀

4. 9.2 x 10⁴ g

Stoichiometry

1.  a.  2 CH₃OH  +  3O₂ à  2CO₂  +   4H₂O

    b.   750 g   O2

     c.  563. g H₂O

2.           2Fe  +  PbCl₂ à  2FeCl₃   +  3 Pb

     mol Fe = 1.79     mol Cl = 0.361

    PbCl₂ completely reacts and is the limiting reactant.

    Fe is excess

   Maximum Pb  74.8 g