Interactive Mole Concept Quiz

Test your understanding of the mole concept in chemistry

This quiz is based on the SaveMyExams revision notes for IGCSE Co-ordinated Sciences Chemistry. Answer the questions below to test your understanding of the mole concept.

After answering each question, click "Check Answer" to see if you're correct. Use "Show Answer" if you need help.

1
What is the definition of a "mole" in chemistry, and what is the specific numerical value of the Avogadro constant?
Model Answer: A mole is the amount of substance that contains the same number of particles (atoms, molecules, ions, etc.) as there are atoms in exactly 12g of carbon-12. The Avogadro constant is 6.02 × 10²³ mol⁻¹.
2
A sample of pure carbon contains exactly 6.02 × 10²³ atoms. What is the mass of this sample, and what is the name given to this specific mass for any element?
Model Answer: The mass of this sample is 12g. This specific mass is called the molar mass, which for any element is the mass of one mole of its atoms (numerically equal to its relative atomic mass in grams).
3
The relative atomic mass (Aᵣ) of sulfur is 32. Explain what this means in terms of the mass of one mole of sulfur atoms.
Model Answer: This means that one mole of sulfur atoms has a mass of 32g. The relative atomic mass tells us the mass of one mole of atoms of that element in grams.
4
Using the formula number of moles = mass / molar mass, calculate the number of moles in 11.5 grams of sodium (Aᵣ of Na = 23).
Model Answer: Number of moles = mass / molar mass = 11.5g / 23g/mol = 0.5 moles.
5
Which has more atoms: 1 mole of helium gas or 1 mole of copper? Justify your answer using the concept of the mole.
Model Answer: They have the same number of atoms. One mole of any substance always contains the same number of particles (6.02 × 10²³), regardless of what the substance is. So 1 mole of helium and 1 mole of copper both contain 6.02 × 10²³ atoms.

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