Grade 10 Chemistry: Mole Concept Worksheet
A worksheet for Grade 10 Chemistry students to practice calculations and understanding of the mole concept, including molar mass, Avogadro's number, and gas volumes.
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Grade 10 Chemistry: Mole Concept
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Read each question carefully and provide clear, concise answers. Show all your work for calculation problems.
1. One mole of any substance contains particles, a number known as Avogadro's constant.
2. The molar mass of a substance is equal to its mass expressed in grams per mole.
3. At Standard Temperature and Pressure (STP), one mole of any gas occupies a volume of liters.
4. Calculate the molar mass of water (H₂O). (Atomic masses: H=1.01 g/mol, O=16.00 g/mol)
5. How many molecules are present in 2.5 moles of carbon dioxide (CO₂)?
6. What is the volume occupied by 0.75 moles of oxygen gas (O₂) at STP?
7. You have a sample of 12.04 x 10²³ atoms of Helium. How many moles of Helium do you have?
8. Which of the following represents the correct molar mass of methane (CH₄)? (Atomic masses: C=12.01 g/mol, H=1.01 g/mol)
13.02 g/mol
16.05 g/mol
17.03 g/mol
28.05 g/mol
9. How many moles are in 88.0 grams of carbon dioxide (CO₂)? (Atomic masses: C=12.01 g/mol, O=16.00 g/mol)
1 mole
2 moles
4 moles
8 moles
10. Avogadro's number is 6.022 x 10²³ particles per mole.
True
False
11. The molar mass of a compound is always greater than the sum of the atomic masses of its constituent elements.
True
False
12. A sample of an unknown gas has a mass of 5.0 grams and occupies a volume of 3.5 liters at STP. Calculate the molar mass of the gas and suggest a possible identity for the gas (e.g., O₂, N₂, CH₄). Show your work.