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Mole Calculations 2

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Page 1: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Mole Calculations 2

Page 2: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Molar Mass

The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu.

The molar mass is the mass of one mole of particles

and the unit is grams/mole.

Page 3: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Formula Mass (amu) Molar Mass (g/mol)

H 1.0 amu 1.0 g/mole

4.0 g/mole4.0 amuHe

CO2

Page 4: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

The molecular mass is the molar mass of a covalent

Compound.

CO2

1 ( 12.0 amu) + 2 (16.0 amu)

= 44.0 amu

Page 5: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Formula Mass (amu) Molar Mass (g/mol)

H 1.0 amu 1.0 g/mole

4.0 g/mole4.0 amuHe

CO244.0 amu 44.0 g/mole

Fe2O3

Page 6: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

The formula mass is the molar mass of an ionic

compound.

Fe2O3

2 (55.8 amu) + 3 (16.0 amu)

= 159.6 amu

Page 7: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Formula Mass (amu) Molar Mass (g/mol)

H 1.0 amu 1.0 g/mole

4.0 g/mole4.0 amuHe

CO244.0 amu 44.0 g/mole

Fe2O3159.6 g/mole

Al(NO3)3 .5H2O

Ni2(CO3)3297.4 g/mole

Page 8: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Al(NO3)3 .5H2O

1 ( 27.0) + 3 (14.0) + 9 (16.0) + 10 (1.01) + 5 (16.0)

Al N O H O

303.1 g/mole

Page 9: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Formula Mass (amu) Molar Mass (g/mol)

H 1.0 amu 1.0 g/mole

4.0 g/mole4.0 amuHe

CO244.0 amu 44.0 g/mole

Fe2O3297.4 g/mole

Al(NO3)3 .5H2O

303.1 g/moleNi2(CO3)3

297.4 g/mole

Page 10: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Particles Moles Grams

1.00 mole = 6.02 x 1023 particles Molar Mass

From Periodic Table? g / mole

The molar mass is a new conversion factor that can convert between grams and molesAvogadro’s number is another conversion factor that can convert between moles and particles

Page 11: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Convert 56.6 grams of C to moles.

Don’t forget sig figs!

3 sig figs

= 4.72 molesx 1 mole12.0 g

56.6 g

Page 12: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Convert 6.9 moles of PbO2 into grams

= 1.7 x 103 g

1 molex 239.2 g6.9 moles

Page 13: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Two StepMole Calculations

Page 14: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Convert 2.00 g CH4 into molecules

grams moles molecules

= 7.51 x 1022 moleculesx 6.02 x 1023 molecules1 mole16.04 g

x 1 mole2.00 g CH4

Page 15: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Convert 9.56 x 1026 molecules Cl2 into grams.

molecules moles grams

= 1.13 x 105 g x 71.0 g

6.02 x 1023 molec

x 1 mole 9.56x1026 molec Cl2

1 mole

Page 16: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Convert 692.5 grams Na2CO3 into formula units.

g moles formula units

= 3.93 x 1024 FUx 6.02 x 1023 FU

1 mole106.0 g

x 1 mole692.5 g Na2CO3

Page 17: Mole Calculations 2. Molar Mass The atomic mass of an element is the relative mass compared to carbon-12. The unit is the atomic mass unit or amu. The

Convert 8.66 x 1024 formula units CaCl2 into grams

formula units moles g

= 1.60 x 103 g x 111.1 g 6.02 x 1023 FU 1 mole

x 1 mole8.66 x 1024 FU CaCl2


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