Moles, Mass & Molecules: Understanding Avogadro's Number
Test your knowledge of fundamental chemical calculations and concepts involving Avogadro's number, moles, and molar mass.
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Quiz Questions & Answers
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Question 1: What is Avogadro's number (to 2 significant figures)?
3.2 × 10²³ particles/mole
6.0 × 10²³ particles/mole
9.1 × 10²³ particles/mole
4.5 × 10²³ particles/mole
Question 2: How many grams are in one mole of carbon-12?
6 grams
14 grams
12 grams
1 gram
Question 3: If you have 32 grams of oxygen (O₂), how many moles do you have?
2 moles
1 mole
0.5 moles
4 moles
Question 4: Which statement about moles is FALSE?
A mole is always equal to 6.02 × 10²³ particles
A mole of any substance has the same number of particles
A mole of different substances always has the same mass
A mole is a counting unit like a dozen
Question 5: How many atoms are in 2 moles of helium (He)?
6.02 × 10²³ atoms
1.20 × 10²⁴ atoms
3.01 × 10²³ atoms
2.00 × 10²³ atoms
Question 6: What is the molar mass of water (H₂O)?
18 g/mol
28 g/mol
16 g/mol
20 g/mol
Question 7: What mass of sodium chloride (NaCl) contains 3.01 × 10²³ formula units?
29.25 g
58.5 g
23 g
35.5 g
Question 8: How many molecules are in 44 grams of CO₂?
3.01 × 10²³ molecules
6.02 × 10²³ molecules
1.20 × 10²⁴ molecules
4.50 × 10²³ molecules
Question 9: What's the main purpose of using moles in chemistry?
To make calculations more difficult
To bridge between atomic and macroscopic scales
To measure temperature
To calculate density
Question 10: In a balanced chemical equation, what do the coefficients represent?
The atomic mass of each element
The ratio of moles of each substance
The number of electrons
The density of each substance