Chapter 8

Mole ConversionsPart 1

How many moles are in 12.3 g of uranium?

How many moles are in 12.3 g of uranium?

12.3 g mol U

238.0 g= 0.0517 mol U

How many grams are in 3.39 mol of table salt, NaCl?

How many grams are in 3.39 mol of table salt, NaCl?

3.39 mol NaCl 58.5 g

mol= 198 g NaCl

How many atoms are in 5.2 mol of Cu

How many atoms are in 5.2 mol of Cu

5.2 mol Cu 6.02 x 1023 Cu atoms

mol Cu= 3.1 x 1024 Cu atoms

How many moles are in 9.76 x 1024 molecules of sulfuric acid, H2SO4?

How many moles are in 9.76 x 1024 molecules of sulfuric acid, H2SO4?

9.76 x 1024 H2SO4 molecules mol H2SO4

= 16.2 mol H2SO4

6.02 x 1023 H2SO4 molecules

Some gaseous elements are composed of atoms

Other gaseous elements are composed of molecules

Many Gaseous elements are “diatomic”

Diatomic Molecules

H2 O2 N2 Cl2 F2 I2 Br2

Hydrogen (H2) Fluorine (F2)Oxygen (O2) Nitrogen (N2) Chlorine (Cl2) Bromine (Br2)Iodine (I2)

How can you tell which gaseous elements are atoms and which are

diatomic molecules?

Diatomic Molecules

H O N Cl F I Br

H2 O2 N2 Cl2 F2 I2 Br2

Hydrogen (H2) Fluorine (F2)Oxygen (O2) Nitrogen (N2) Chlorine (Cl2) Bromine (Br2)Iodine (I2)

Find the mass of 3.26 x 1028 molecules of O2

Find the mass of 3.26 x 1028 molecules of O2

3.26 x 1028 O2 molecules

Find the mass of 3.26 x 1028 molecules of O2

3.26 x 1028 O2 molecules mol O2

6.02 x 1023 O2 molecules

Find the mass of 3.26 x 1028 molecules of O2

3.26 x 1028 O2 molecules mol O2 32.0 g

6.02 x 1023 O2 molecules mol O2

= 1.73 x 106 g O2

• Prozac, C17H18F3NO, is an antidepressant in a group of drugs called selective serotonin reuptake inhibitors (SSRIs). Prozac affects chemicals in the brain that may become unbalanced and cause depression, panic, anxiety, or obsessive-compulsive symptoms. Find its molar mass.

• Prozac, C17H18F3NO, is an antidepressant in a group of drugs called selective serotonin reuptake inhibitors (SSRIs). Prozac affects chemicals in the brain that may become unbalanced and cause depression, panic, anxiety, or obsessive-compulsive symptoms. Find its molar mass.

17(12.0) + 18(1.0) + 3(19.0) + 14.0 + 16.0 = 309.0g/mol

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

20.0 mg C17H18F3NO

day

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

20.0 mg C17H18F3NO 0.001g

day mg

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

20.0 mg C17H18F3NO 0.001g mol

day mg 309.0 g

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

20.0 mg C17H18F3NO 0.001g mol 7 days

day mg 309.0 g week

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

20.0 mg C17H18F3NO 0.001g mol 7 days

day mg 309.0 g week= 4.53 x 10 - 4 mol/week

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

20.0 mg C17H18F3NO 0.001g mol 7 days

day mg 309.0 g week= 4.53 x 10 - 4 mol/week

How many atoms of C would the patient consume in one week?

• The recommended starting dose of prozac is

20.0 mg each day.

• How many moles of prozac would a patient starting prozac take in one week?

20.0 mg C17H18F3NO 0.001g mol 7 days

day mg 309.0 g week= 4.53 x 10 - 4 mol/week

How many atoms of C would the patient consume in one week?

4.53 x 10-4 mol C17H18F3NO 6.02 x 1023 molecules 17 atoms C

mol molecule

= 4.64 x 1021 C atoms

Information for Upcoming Mole Quiz

• How does a mole relate to particles and mass? (example: One mole of H2O is 6.02 x 1023 H2O molecules and has a mass of 18g).

• Be able to use this information in factor-label problems.

• Know how to determine the number of atoms in a molecule. Be able to use this information in factor-label problems.

• Be able to determine the number of grams/molecule.• Identify the diatomic gases.• Do metric conversions.

Homework

• Worksheet – Mole Conversions (There is a front and back to this worksheet).