Introduction to Moles
A Grade 12 Chemistry worksheet covering mole concept, Avogadro's number, molar mass, and mole calculations.
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Introduction to Moles
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Read each question carefully and provide your answers in the space provided. Show all your work for calculations.
1. What is the value of Avogadro's number?
1.0 x 10^23 particles/mol
6.022 x 10^23 particles/mol
6.022 x 10^22 particles/mol
1.0 x 10^22 particles/mol
2. The molar mass of a substance is defined as:
The mass of one atom of the substance.
The mass of one molecule of the substance.
The mass of one mole of the substance.
The mass of Avogadro's number of grams.
3. One mole of any substance contains particles.
4. The unit for molar mass is .
5. The concept of the mole allows us to convert between the mass of a substance and the of particles.
6. Calculate the molar mass of water (H₂O). (Atomic masses: H=1.01 g/mol, O=16.00 g/mol)
7. How many moles are in 22.0 grams of carbon dioxide (CO₂)? (Atomic masses: C=12.01 g/mol, O=16.00 g/mol)
8. A mole of feathers has more mass than a mole of lead.
True
False
9. One mole of oxygen gas (O₂) contains 6.022 x 10^23 oxygen atoms.
True
False
10. A chemist needs to prepare a solution containing 0.50 moles of sodium chloride (NaCl). How many grams of NaCl should the chemist weigh out? (Atomic masses: Na=22.99 g/mol, Cl=35.45 g/mol)
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