# Molar Mass

(1)

## Molar Mass

Learning Target

Students will be able to explain molar mass and perform calculations.

(2)

-23

12

### C. It has been arbitrarily assigned a mass of exactly 12 atomic mass units (amu)

Learning Target

Students will be able to explain molar mass and perform calculations.

(3)

1

12

12

12

12

12

12

### C atom?

Learning Target

Students will be able to explain molar mass and perform calculations.

(4)

## Atomic Mass Unit-Revision

### •4.5 X 12 amu = 54 amu

Learning Target

Students will be able to explain molar mass and perform calculations.

(5)

## Masses of Substances

### • If it were possible to mass individual atoms, 7 helium atoms would have the same mass as 2 nitrogen atoms.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(6)

## Numbers for Counting Quantities

### = 602,000,000,000,000,000,000,000 = 6.02 X 1023

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(7)

23

### • 1 mole of Mg atoms is 602 billion trillion Mg atoms

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(8)

## *The Mole

### molecules (CaCO 3 )?

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(9)

(10)

## *Mass of a Mole

### approximate mass of one mole of 24 Mg atoms? Explain your reasoning.

Learning Target

Students will be able to explain molar mass and perform calculations.

(11)

## Mass of a Mole

24

12

12

12

24

24

12

24

12

12

24

### 2 X 12 g = 24.0 g

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(12)

## The Mole

23

-23

### • The mass of a mole of fluorine atoms is _________ g

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(13)

23

## Molar Masses

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(14)

23

### , but one mole samples of different substances will have different masses.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(15)

23

12

23

12

12

12

4

23

4

4

4

### He.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(16)

## One Mole of Manganese

### When you measure 54.94 g of manganese on a balance, you indirectly count 6.02 x 10 23 atoms of manganese.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(17)

## Atoms in a paper clip

### figure out how many atoms of iron are in a paper clip.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(18)

## Atoms in a paper clip

### ____________atoms Fe

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(19)

## *Do Now: Molar Mass

### Determine the molar mass of NaCl using molar masses from the Periodic Table.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(20)

## * Measuring a Mole

### • How many aluminum atoms are in your 1 mole sample? Explain your reasoning.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(21)

## Measuring a Mole Activity

### molar masses.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(22)

## *Do Now

### • You need 1 mole of water for a reaction. How would you find this (step by step)?

Learning Target

Students will be able to explain molar mass and perform calculations.

(23)

## Conservation of Mass

### carbon atom and two oxygen atoms compares with the mass of a molecule of carbon dioxide (CO 2 )?

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(24)

## Mass of a Backpack

### Similarly, the mass of a mole of a compound equals the sum of the masses of every particle that makes up the compound.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(25)

### 1 x 32.06g/mol + 3 x 15.99g/mol = 80.06 g/mol

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(26)

## Counting by Measuring Mass

### Think how can you measure 1 mole of water without counting individual H 2 O molecules.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(27)

## Molar mass of H 2 O

### *What is the molar mass of water (H2O)?

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(28)

## *Molar Mass

### (sucrose) using molar masses from periodic table.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(29)

## *Molar Mass

### Determine the molar mass of C 8 H 18 (octane) using molar masses from periodic table.

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(30)

## Moles and Gases

### •

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

(31)

## *Do Now

### b. Is it possible to count Avogadro’s number of salt particles individually?

Learning Target

Students will be able to explain molar mass and Avogadro’s number and perform calculations.

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## References

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