Lecture 10.2a- Mole Mass Conversions

Bellwork- An argument for recycling

An aluminum can contains 0.5 moles of aluminum metal.

1.How many particles are in the aluminum can?

2.How much does one mole of aluminum weigh?

3.What is the mass of the can?

Converting between moles and number of particles

involves multiplying or dividing by

6.02 x 1023

Converting between moles and mass involves multiplying or

dividing by

the molar mass of the substance

Convert from moles to mass

How much does 3.75 moles of magnesium metal weigh?

Convert from moles to mass

How much does 3.75 moles of magnesium metal weigh?

3.75 moles Mg

Convert from moles to mass

How much does 3.75 moles of magnesium metal weigh?

3.75 moles Mg

X

Convert from moles to mass

How much does 3.75 moles of magnesium metal weigh?

3.75 moles Mg

X 24.305 grams

1 mole Mg

Convert from moles to mass

How much does 3.75 moles of magnesium metal weigh?

3.75 moles Mg

X 24.305 grams

1 mole Mg

= 91.1 grams Mg

Convert from moles to mass

How much does 3.75 moles of magnesium metal weigh?

3.75 moles Mg

X 24.305 grams

1 mole Mg

= 91.1 grams Mg

WHERE THE HECK DID THIS COME FROM?!?

Convert from moles to mass

How much does 3.75 moles of magnesium metal weigh?

3.75 moles Mg

X 24.305 grams

1 mole Mg

= 91.1 grams Mg

WHERE THE HECK DID THIS COME FROM?!?

The periodic

table!

10.5Moles to grams

9.45 mol Al2O3 x ___________ = 964g Al2O3

1 mol Al2O3

102g Al2O3

2 Al = 54g

3 O = 48 g

102g

Grams to moles

Mole Review

huge #

of

particles

6x1023

6x1023

(g)grams(mass)molar

mass

molar mass

Use the periodic

table!

Use the mole

banner!

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of As

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of AsX 1 mole

6.02x1023

atoms

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of AsX 1 mole

6.02x1023

atoms

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of AsX 1 mole

6.02x1023

atoms

= 4 moles As

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of AsX 1 mole

6.02x1023

atoms

= 4 moles As

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of AsX 1 mole

6.02x1023

atoms

= 4 moles As X 74.9 grams

1 mole

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of AsX 1 mole

6.02x1023

atoms

= 4 moles As X 74.9 grams

1 mole

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of As

= 299.6 grams of Arsenic

X 1 mole

6.02x1023

atoms

= 4 moles As X 74.9 grams

1 mole

Convert from number of particles to mass in

grams

2.4 x 1024 atoms of As

= 299.6 grams of Arsenic ≈300g for multiple choice

X 1 mole

6.02x1023

atoms

= 4 moles As X 74.9 grams

1 mole

1. Calculate the mass in grams of a sample containing 1.85 x 1034 molecules of water.

a. 3.07 x 1010 g

b. 5.53 x 1011 g

c. 188 g

d. 8.46 x 103 g

10.2 Section Quiz.

2. Calculate the number of moles in a spoonful of table sugar (C12H22O11) having a mass of 10.5 g.a. 32.6 molb. 3.59 103 molc. 3.07 10–3 mold. 1.85 1022 mol

10.2 Section Quiz.