In chemistry if you are not proficient at converting between chemical units you will have a rough time.  This exercise will hopefully help you to do these conversions easily.

 After the diagram above has been explained by your teacher refer to it while performing the following conversions:
 

Single-step conversions

1.  32.4 molecules Cl2    mole Cl2 (5.38 x 10-23)

2.  4.52 mole Ag    atoms Ag (2.72 X 10 24)

3.  75.3 g NH3    mole NH3 (4.42)

4.  0.0453 mole CH4    g CH4  (.727)

5.  33.4 L H2     mole H2 (1.49)

6.  1.99 mole N2    L N2  (44.6)
 

Two-step conversions (cha cha cha)

7.  1.45 g O2     L O2   (1.02)

8.  4.00 x 1025 NaCl    g NaCl  (3.88 x 103)

9.  401 L NO2     molecules NO2 (1.08 x 1025)
 

Conversion Mania!!

10.  3.6 g CO2     atoms of O  (9.9 x 1022)

11.  3.65 x 1012 NH4+    moles (NH4)2SO4 (3.03 x 10-12)

12.  54.3 g Na3PO4    moles Na+  (.993)

13.  25.7 L CO2    atoms (C & O) (2.07 x 1024)
 

Word problems

14.  A balloon at STP is filled with 2.34 L of H2.  How many molecules of H2 are in the balloon?  How many H atoms are in the balloon?  What is the mass of H2 in the balloon?
(6.29 x 1022, 1.26 x 1023, .211 g H2)

15.  One hiccup has a volume at STP of approximately .20 L.  If a hiccup is made up of pure O2, what is the mass of one hiccup?
(.29 g)

16.  A human tear drop has a mass of approximately .100 g.  How many molecules of H2O are contained in one tear drop?
(3.34 x 1021)

17.  Given: 10.0 g C2H6
  10.0 g NH3

 a. Which of the above quantities contains more molecules?

 b. Which of the above quantities contains more atoms?