Grade 9 Chemistry: Mole Concept Worksheet
This worksheet covers fundamental concepts of the mole, Avogadro's number, and molar mass for Grade 9 Chemistry students.
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Grade 9 Chemistry: Mole Concept
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Read each question carefully and answer to the best of your ability. Show all your work for calculation problems.
1. What is the value of Avogadro's number?
6.022 x 10^22
6.022 x 10^23
1.0 x 10^23
1.0 x 10^22
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 in grams of one mole of the substance.
The total mass of all atoms in a sample.
1. A mole is defined as the amount of substance that contains particles.
2. The unit for molar mass is .
3. The atomic mass of an element expressed in grams is equal to its .
1. Calculate the molar mass of water (H₂O). (Atomic mass of H = 1.008 g/mol, O = 15.999 g/mol)
2. How many moles are present in 22 grams of CO₂? (Atomic mass of C = 12.011 g/mol, O = 15.999 g/mol)
1. One mole of any substance contains the same number of particles.
True
False
2. The molar mass of an element is numerically equal to its atomic number.
True
False
Consider a sample of 18.015 grams of water (H₂O).
a) How many moles of water are in this sample?
b) How many individual water molecules are in this sample?
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