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AP Chemistry
Unit 1: Atomic Structure and Properties
1.1 Moles and Molar Mass
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One mole of a substance contains 6.022 × 10²³
particles
The mole is defined as the amount of a substance that contains 6.022 × 10²³
particles
The molar mass of a substance is expressed in grams per
mole
Steps to calculate molar mass using the periodic table
1️⃣ Identify the elements
2️⃣ Find atomic masses
3️⃣ Add atomic masses
What is the value of Avogadro's number?
6.022 × 10²³
What is the unit of molar mass?
grams per mole
What is the molar mass of a substance if 2 moles weigh 88.02 grams?
44.01 g/mol
What is the atomic mass of carbon?
12.01 g/mol
What is the formula to convert grams to moles?
Moles = Grams / Molar Mass
Convert 50 grams of CO₂ to moles.
1.136 moles
What does the mole measure?
Amount of substance
Avogadro's number is 6.022 × 10²³.
True
Avogadro's number is a fundamental constant in chemistry.
True
The mole is defined as the amount of substance containing 6.022 × 10²³
particles
Carbon has an atomic mass of
12.01 g/mol
.
True
Avogadro's number connects
moles
to the number of particles in a substance.
True
One mole of a substance contains 6.022 × 10²³
particles
Molar mass is essential for
stoichiometric
conversions between mass and moles.
True
Molar mass is used in stoichiometry to convert between mass and
moles
.
True
The molar mass of CO₂ is calculated as (1 × 12.01) + (2 ×
16.00
) = 44.01 g/mol
What is the formula to convert moles to grams?
Grams = Moles × Molar Mass
How many grams are in 3 moles of H₂O (molar mass = 18.015 g/mol)?
54.045 grams
What constant connects moles to the number of particles?
Avogadro's number
What is the formula to convert grams to moles?
Moles = Grams / Molar Mass
What is the significance of Avogadro's number?
Connects moles to particles
What is the formula for molar mass?
Molar Mass = Mass / Moles
The formula for molar mass is
Mass/Moles
Oxygen has an atomic mass of 16.00
g/mol
Molar mass is expressed in units of grams per
mole
What is the value of Avogadro's number?
6.022 × 10²³
Match the unit with its definition:
Gram ↔️ Weight of a substance
Mole ↔️ 6.022 × 10²³ particles
Molar Mass ↔️ Mass of one mole
Avogadro's Number ↔️ Number of particles
Steps to calculate molar mass using the periodic table:
1️⃣ Identify the elements
2️⃣ Find atomic masses
3️⃣ Add atomic masses
Adding the atomic masses of all atoms in a compound gives its molar mass.
True
How many moles are in 50 grams of CO₂ (molar mass = 44.01 g/mol)?
1.136 moles
The formula to convert grams to moles is Moles = Grams / Molar
Mass
Understanding molar mass conversions is vital for solving
stoichiometry
problems.
True
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