Introduction to Moles
A Grade 9 science worksheet introducing the concept of moles, Avogadro's number, and molar mass.
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Introduction to Moles
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Read each question carefully and answer to the best of your ability. Show all your work for calculations.
1. What is the approximate value of Avogadro's number?
6.022 x 10^22
6.022 x 10^23
6.022 x 10^24
6.022 x 10^25
2. What unit is used to express molar mass?
grams
moles
grams/mole
liters
3. The mole is a unit of measurement used in chemistry to express of a chemical substance.
4. One mole of any substance contains particles, which is known as Avogadro's number.
5. Calculate the molar mass of water (H₂O). (Atomic mass of H = 1.008 g/mol, O = 15.999 g/mol)
6. How many moles are present in 44.01 g of carbon dioxide (CO₂)? (Atomic mass of C = 12.011 g/mol, O = 15.999 g/mol)
7. The molar mass of an element is numerically equal to its atomic mass.
True
False
8. Avogadro's number is only applicable to atoms, not molecules.
True
False