Grade 10 Chemistry: Mole Conversions Worksheet
A worksheet for Grade 10 chemistry students to practice mole conversions, including calculations between moles, mass, and number of particles.
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Grade 10 Chemistry: Mole Conversions
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Read each question carefully and show all your work for calculations. Use the following constants where necessary: Avogadro's number = 6.022 x 10^23 particles/mol.
1. What is the molar mass of water (H₂O)? (Atomic masses: H=1.008 g/mol, O=15.999 g/mol)
1.008 g/mol
18.015 g/mol
16.999 g/mol
2.016 g/mol
2. How many molecules are in 2.5 moles of CO₂?
6.022 x 10²³ molecules
1.5055 x 10²⁴ molecules
2.4088 x 10²⁴ molecules
1.2044 x 10²³ molecules
3. The number of particles in one mole of any substance is known as .
4. To convert grams of a substance to moles, you must divide by its .
5. Calculate the number of moles in 50.0 grams of calcium carbonate (CaCO₃). (Atomic masses: Ca=40.08 g/mol, C=12.01 g/mol, O=15.999 g/mol)
6. How many grams are present in 0.75 moles of sodium chloride (NaCl)? (Atomic masses: Na=22.99 g/mol, Cl=35.45 g/mol)
7. One mole of oxygen gas (O₂) has the same mass as one mole of water (H₂O).
True
False
8. Avogadro's number can be used to convert between moles and the number of particles (atoms, molecules, ions).
True
False
9. A sample of iron (Fe) contains 1.25 x 10²⁴ atoms. How many moles of iron are in the sample? (Atomic mass: Fe=55.845 g/mol)
10. What is the mass of 3.011 x 10²³ molecules of methane (CH₄)? (Atomic masses: C=12.01 g/mol, H=1.008 g/mol)
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