Relationship Between Density, Avogadro’s Number, and Moles

                                                                                                                                                                  GIA 5-5
Learning Objectives:                                                                                                                               Chapter 10

1.  For each of the following setups, determine whether the conversion factor is properly written.  If the setup is correct, cancel out the units of measurement and use a calculator to find a final answer.  If the setup is incorrect, rewrite the conversion factor properly and solve the problem.

2.  Use the conversion factor method (dimensional analysis) to set up and solve the following problems on the back of this page:

a)      The molar mass of CO₂ is 44 grams per mole.  How many moles are present in 32 grams of CO₂?

b)      The density of zinc is 7.14 g/cm³.  What volume is occupied by 88 grams of zinc metal?

c)      Find the mass of 0.89 mol of CaCl₂.

d)      Find the mass of 1.112 mol of HF.

e)      How many moles of ethane (C₂H₆) contain 8.46 x 10²⁴ molecules?

f)       What is the mass of 3.62 x 10²⁴ molecules of methanol (CH₃OH)?

g)      How many molecules are in 5.6 g of H₂S?