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2nd Sem M4 Chem Chapter 1

2nd Sem M4 Chem Chapter 1

Assessment

Presentation

•

Science, Chemistry

•

8th - 10th Grade

•

Practice Problem

•

Hard

Created by

Lady Alias

Used 3+ times

FREE Resource

59 Slides • 75 Questions

1

Atomic Mass and Mole

​Learning Objectives:

  • Define the mole as a unit of measurement in chemistry and explain its importance.

  • Differentiate between atomic mass and molar mass, and understand the relationship between them.

  • Calculate molar mass of elements and compounds using atomic masses from the periodic table.

  • Perform conversions between moles, mass, and number of particles (atoms, molecules).

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​The Mole

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Multiple Choice

Which of the following statements regarding the mole is NOT correct?

1

A mole is a counting unit

2

Equal to 6.02 x 1023 particles.

3

The concept of mole is similar to the concept of dozen

4

none of the above

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Multiple Choice

When comparing a mole of oxygen and a mole of sulfur, how many atoms does each have?

1

oxygen has 16 grams of atoms

2

sulfur has 32.06 grams of atoms

3

both contains 6.02 x 1023 atoms

4

can not be determined

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Multiple Choice

Which would have more atoms?
1

1 mole of Li

2

1 mole of Au

3

1 mole of Si

4

None, all are equal

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Multiple Choice

How many atoms of iodine are in a mole of iodine (I)?

1

53

2

63.55g

3

126.9

4

6.02 x 1023

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Multiple Choice

How can you figure out how particles (atoms) there are in 2 moles?
1

2

2

2 x (6.02 x 1023)

3

2 x (atomic mass)

4

2 Ã· (6.02 x 1023)

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Multiple Choice

How many particles are found in a mole?

1

6.022 x 10236.022\ x\ 10^{23}  

2

6.022 x 10236.022\ x\ 1023  

3

6022 x 10236022\ x\ 10^{23}  

4

6022 x 10236022\ x\ 1023  

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Multiple Choice

How many Carbon Atoms are in 4 moles of Carbon?

1

6.02 x 1023

2

1.33 x 1023

3

4.52

4

2.408 x 1024

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Multiple Choice

How many particles are there in 2 moles of carbon-12 atoms

1

2

2

6.02 x 1023

3

3.01 x 1023

4

1.204 x 1024

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Multiple Choice

How many atoms are there in 3 moles of carbon dioxide?

1

3

2

6.02 x 1023

3

1.806 x 1024

4

5.418 x 1024

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Multiple Choice

How many particles are there in 3 moles of Argon atoms

1

3

2

6.02 x 1023

3

1.806 x 1024

4

1.806 x 1023

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Multiple Choice

A mole = Avogadro's number = 6.022 x 1023

1

true

2

false

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Multiple Choice

The number 6.02 x 1023 is called...
1

Molar number

2
Bohr's number
3

Scientist's number

4
Avogadro's number

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Multiple Choice

Which of the following statements regarding the mole is correct?

1

A mole is a counting unit equal to 6.02 x 1023 particles.

2

The number of particles in a mole is known as Avogadro’s number.

3

1 mole = Avogdro's number

4

all of the above

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The Mole Concept

By Guzman

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Avogadro's Number & Molar Mass

​The mass of one mole of a substance is called Molar Mass (MM)

  • Units are g​/mol

  • In an element 1 mole is equal to its Atomic Mass​

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Molar Mass

1 mole of atoms of any element will have a mass equal to its relative Atomic Mass

  • Its shown in grams​

​Once Again

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​1 Mol = 23 grams

2 Mol = 2 x 23 grams =

3 Mol = 3 x 23 grams =

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​Examples

How many grams are in 2 mol of Carbon (C)?

  1. Look for the element

  2. Look at the atomic mass

  3. multiply the mol they are asking for​

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Multiple Choice

What are the units used for Molar Mass

1

grams

2

mols

3

g/mol

4

mol/g

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Multiple Choice

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How many grams are in 1 mole of Mg?

1

12 grams

2

24 grams

3

36 grams

4

6.022 x 1023 grams

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Multiple Choice

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How many grams are in 3 mol of carbon?

1

6 grams

2

12 grams

3

18 grams

4

36 grams

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Multiple Choice

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How many grams are in 5 mol of lithium

1

3 grams

2

15 grams

3

35 grams

4

7 grams

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Multiple Choice

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How many grams are in 10 mol of fluorine?

1

19 grams

2

190 grams

3

90 grams

4

9 grams

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Formula Weight

​Its the sum of all the atomic weights in a chemical formula.

to find the formula weight of a compound:

  1. find the number of atoms of each element present in the compound

  2. multiply the number of atoms by their respective weight

  3. add the atomic weights of all the elements present.

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Example: H2O

  1. H2O contains 2 atoms of Hydrogen and 1 atom of Oxygen​

    ​

  2. Hydrogen: 2 x 1.0080 = 2.016

Oxygen: 1 x 16 = 16

​

  1. 2.016 + 16 = 18.016

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Multiple Choice

what are the units used for Atomic Weight (Molecular Weight)?

1

amu

2

grams

3

g/mol

4

mol

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Multiple Choice

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Find the atomic weight (molecular weight) of Sugar - C12H22O11

1

198.176 amu

2

342.308 amu

3

144.132 amu

4

29.019

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Multiple Choice

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Find the atomic weight (molecular weight) of Vitamin A - C20H30O

1

286.46 amu

2

240.22 amu

3

29.019 amu

4

129.46 amu

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Multiple Choice

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Find the atomic weight (molecular weight) of carbon monoxide - CO

1

16 amu

2

12.011 amu

3

28.011 amu

4

29.019 amu

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Multiple Choice

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Find the atomic weight (molecular weight) acetic acid - CH3COOH

1

24.022 amu

2

31.035 amu

3

29.019 amu

4

60.054 amu

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Putting these together

​Gram Formula Mass (Molar Mass)

  • ​This is the combination of formula weight and mol

  • Moles are used not only to describe elements, but compounds as well.

  • When asked about the weight of 1 mol of a compound, you will follow the same steps as finding the molecular weight of your compound.​

  • its units are g/mol​

​

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Molar Mass

  • molar mass = 1 mole

  • CO2

  • C=12 , O2 =16 x 2 = 32

  • 12 + 32 = 44 g/mol

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​Example

Determine the gram formula mass of each compound: KMnO4

(this is asking for the mass of one mol of your compound)

​

K = 1 x 39.098 = 39.098

Mn = 1 x 54.938 = 54.938

O = ​4 x 16 = 64

= 158.036​ g/mol

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Multiple Choice

What are the units used for Gram Formula Mass ?

1

amu

2

grams

3

mol

4

g/mol

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Multiple Choice

Determine the gram formula mass of KCl

1

74.548 amu

2

35.45 amu

3

74.548 g/mol

4

35.45 g/mol

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Multiple Choice

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Molar Mass of CH4

1

12 g/mol

2

16 g/mol

3

4 g/mol

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Multiple Choice

Determine the gram formula mass (Molar Mass) of H2SO4

1

98.076 mol

2

98.076 g/mol

3

98.076 g

4

98.076 amu

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Multiple Choice

CO2 = 44 g/mol

How much would 3 moles of CO2 equal?

1

132g/mol

2

33g/mol

3

404g/mol

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Multiple Choice

Molar Mass of K2CO3

1

138.205 g/mol

2

35 g/mol

3

78.2 g/mol

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Multiple Choice

Molar Mass of Ag2O

1

231.7 g/mol

2

56.2 g/mol

3

734.4 g/mol

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​Calculating moles, given mass (or inverse)

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​Facts on The Mole

  • 1 mole= 6.022 x 1023 atoms

  • The mole can either be a mass or a number of particles

  • ​Abbreviation is 'mol'

  • ​Commonly used term is molar mass = mass of one mole of a substance

    • has the units of g/mol or g.mol-1

  • We can easily convert between mass, moles, and particles

  • We can also easily calcul​ate mass, molar mass, or moles (as long as we have two of these numbers)

​

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Calculating number of particles, given ​moles (or inverse)

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Multiple Choice

How many particles are there in 1 mole of oxygen gas?

[1st Hint: 1 molecule is counted as 1 particle]

1

1

2

6.02 x 1023

3

1.204 x 1024

4

12.04 x 1023

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Fill in the Blank

88 grams of H2O (18 g/mol) is how many moles?

.

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Fill in the Blank

52 grams of O2 (Molar Mass = 32 g/mol) is how many moles?

.

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Fill in the Blank

73 grams of AlBr3 (267 g/mol) is how many moles?

.

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Multiple Choice

800 grams of 2NH3 (34 g/mol) is how many moles?

1

23.52 moles

2

.0425 moles

3

834 moles

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Multiple Choice

How many grams are in 3 mol of carbon?

1

6 grams

2

12 grams

3

18 grams

4

36 grams

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​Examples

How many grams are in 2 mol of Carbon (C)?

  1. Look for the element

  2. Look at the atomic mass

  3. multiply the mol they are asking for​

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Chemical Formulas

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Multiple Choice

How many different elements are present in the following chemical formula: CO2

1

1

2

2

3

3

4

4

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Multiple Choice

How many different elements are present in the following chemical formula: H2SO4

1

1

2

2

3

3

4

4

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Multiple Choice

How many different elements are present in the following chemical formula: CoSO4

1

1

2

2

3

3

4

4

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Multiple Choice

How many different elements are present in the following chemical formula: K2CO3

1

1

2

2

3

3

4

4

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Multiple Choice

How many different elements are present in the following chemical formula: Ag2O

1

1

2

2

3

3

4

4

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Multiple Choice

How many Hydrogen atoms are present in glucose: C6H12O6

1

6

2

12

3

24

4

1

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Multiple Choice

How many Oxygen atoms are present in H2O?

1

1

2

2

3

3

4

4

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Multiple Choice

How many Bromine atoms are present in AlBr3?

1

1

2

2

3

3

4

4

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Multiple Choice

How many Calcium atoms are present in CaCO3?

1

1

2

2

3

3

4

4

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Multiple Choice

How many Sulfur atoms are present in Na2S04?

1

1

2

2

3

3

4

4

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Multiple Choice

How many Sulfur atoms are in Cr(SO4)3?

1

1

2

3

3

4

4

12

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Multiple Choice

How many Oxygen atoms are in Cr(SO4)3?

1

1

2

3

3

4

4

12

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Multiple Choice

How many Chromium atoms are in Cr(SO4)3?

1

1

2

3

3

4

4

12

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Multiple Choice

How many molecules of H2O are present in: 3H2O

1

1

2

2

3

3

4

4

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Multiple Choice

How many atoms of Hydrogen are present in: 3H2O

1

9

2

2

3

3

4

6

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Multiple Choice

How many atoms of Oxygen are present in: 3H2O

1

9

2

2

3

3

4

6

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Multiple Choice

The elements in water are hydrogen and _________.

1

chlorine

2

oxygen

3

nitrogen

4

potassium

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Fill in the Blank

How many total atoms are in the compound, 2Na(OH)2?

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Multiple Select

1. How many total atoms are in this compound?

2. How many atoms of Hydrogen are in C6H12O6?

1

12 total atoms

2

24 total atoms

3

12 atoms of Hydrogen

4

24 atoms of Hydrogen

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Fill in the Blank

How many total atoms are in 6H2SO4? (remember to add your parentheses and distribute).

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Valence Electrons

  • These are the number of ELECTRONS on the OUTER SHELL and they are responsible for how the atom BONDS to other atoms.

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Multiple Choice

What are valence electrons?

1

The total number of electrons in an atom

2

The number of electrons in the outermost shell

3

The number of electrons in the second shell

4

The number of protons in the outermost shell

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Multiple Choice

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How many valence electrons does carbon have?

1

4

2

5

3

6

4

7

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Multiple Choice

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How many ELEMENTS are in this chemical equation?

1

3

2

4

3

9

4

10

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Multiple Choice

Acetic acid is a compound found in vinegar. The chemical formula for acetic acid is CH3COOH.

How many different ELEMENTS are in acetic acid?

1

3

2

5

3

6

4

8

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Multiple Choice

All ____________ are made up of two or more atoms bonded together.

1

atoms

2

molecules

3

electrons

4

elements

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Multiple Choice

The smallest unbreakable unit of a compound is called
1
subscript
2
proton
3
formula
4
molecule

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The REACTANTS are the starting atoms. Basically the reactants mix together and REACT! The PRODUCTS are what you end up with after the chemical reaction occurs. The atoms rearrange to make something new. The something NEW are the PRODUCTS.

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Use RAP to memorize which part of the chemical equation are the reactants and which part are the products

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Multiple Choice

NaOH + HCl --> NaCl + H2O Identify the reactants in the chemical equation above.

1

NaOH and HCl

2

NaCl and H2O

3

HCl and H2O

4

HCl and NaCl

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Multiple Choice

2AgNO3 + CaCl2 --> 2AgCl + Ca(NO3)2

Identify the products in the chemical equation above.

1

2AgNO3 and CaCl2

2

2AgCl and Ca(NO3)2

3

CaCl2 and Ca

4

Ag, Cl, N, and Ca

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Multiple Choice

Cu + 2AgNO3 ⟶\longrightarrow 2Ag + Cu(NO3)2 How many copper (Cu) atoms are there in  Cu(NO3)2 ?

1

1

2

2

3

5

4

6

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Multiple Choice

How many MOLECULES are on the PRODUCT side of the chemical equation NaOH + HCl --> NaCl + H2O

1

1

2

2

3

4

4

5

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Poll

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THE END

Did you learn anything today????

Yes, I did and excited about learning more.

No. I don't care about my grade.

Yes, kinda. The holiday can't come any sooner!!!!

Yes. I also like my science teacher and class.

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Counting Atoms & Chemical Formulas

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Multiple Choice

What elements are present in glucose, C6H12O6?

1

Calcium, Hydrogen, and Oxygen

2

Carbon, Hydrogen, and Oxygen

3

Carbon and Oxygen

4

Calcium and Oxygen

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Multiple Choice

How many carbon (C) atoms are present in glucose, C6H12O6?

1

6

2

12

3

18

4

24

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Multiple Choice

How many hydrogen (H) atoms are in glucose, C6H12O6?

1

6

2

12

3

18

4

24

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Multiple Choice

How many total elements make up glucose, C6H12O6?

1

1

2

3

3

6

4

24

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Multiple Choice

How many total atoms make up glucose, C6H12O6?

1

3

2

6

3

12

4

24

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Multiple Choice

How many atoms of potassium (K) are in 2 molecules of K2SO4?

1

1

2

2

3

4

4

8

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Multiple Choice

How many atoms of sulfur (S) are in 2 molecules of K2SO4?

1

1

2

2

3

4

4

8

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Multiple Choice

How many atoms of oxygen (O) are in 2 molecules of K2SO4?

1

1

2

2

3

4

4

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Atomic Mass and Mole

​Learning Objectives:

  • Define the mole as a unit of measurement in chemistry and explain its importance.

  • Differentiate between atomic mass and molar mass, and understand the relationship between them.

  • Calculate molar mass of elements and compounds using atomic masses from the periodic table.

  • Perform conversions between moles, mass, and number of particles (atoms, molecules).

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