1. Moles to Atoms Conversion Answers:
1. 2 x 1024 atoms Fe
x 1024 atoms Ag
x 1024 atoms He
x 1025 atoms Ti
x 1024 atoms C
x 1024 atoms N
x 1024 atoms H
x 1026 atoms B
x 1026 atoms N
10. 5 x 1019 atoms C
x 1019 atoms Fe
x 1051 atoms C
13. 5 x 1040 atoms H
x 1017 atoms C

2. Atoms to Moles Conversion Answers:
mol Fe
mol Ag
mol He
mol Ti
5. 30 mol C
x 108 mol N
x 10-7 mol H
x mol B
x 1013 mol N
x mol C
x 105 mol Fe
x 10-5 mol C
13. 2 x 10-7 mol H
x mol C

3. Chapter 10.1 Practice Problems Converting Between # of Particles/Moles
1. Calculate the number of molecules in 15.7 mol carbon dioxide.
2. Calculate the number of molecules in mol H2O.
3. Calculate the number of moles in 9.22 x 1023 atoms iron.
4. Calculate the number of moles of sucrose in a sample that contains 2.05 x 1022 sucrose molecules.
5. A student uses mol copper sulfate to carry out a reaction. If the reaction uses up mol copper sulfate, how many formula units are left unreacted?

4. Practice Problems Answers
x 1024 molecules CO2
x 1022 molecules H2O
moles Fe
or 3.41 x 10-2 moles sucrose
x 1021 formula units copper sulfate

5. 10.2 Mass and the Mole Objectives:
Relate the mass of an atom to a mass of a mole of atoms.
Convert between the number of moles and the mass of an element.

6. Mass and the Mole (Cont.)
Molar mass – the amount in grams of one mole of a substance.
Equal to the atomic mass of single elements or the formula mass of compounds.
Units used are always g/mol (grams per mole).
Calculate the molar mass for:
Group 2 elements
Group 18 elements

7. Calculating Molar Mass (Cont.)
Calculating molar mass for molecules/formula units:
You must determine how many atoms of each element you have, first.
Then calculate the molar mass.
Use E/A/M/ chart
E = Element
A = Amount Atoms
M = Molar Mass
 = Total

8. Mass and the Mole (Cont.)
When converting between Mass, Amount, and Number of Particles, convert from:
(Avo’s #) (Molar Mass)
# Particles → Amount → Mass
(Molar Mass) (Avo’s #)
Mass → Amount → # Particles

9. Calculating Molar Mass (Cont.)
Use E/A/M/ chart to first calculate the number of atoms of each element in the formula then calculate the molar mass of the formulas:
CaSO3
K2Cr2O7
Al(NO3)3
Al2(SO4)3

10. Do Problems 15-18, Pages

11. Do Problems 19-21, Page 331