Stoichiometry: Mass and Moles Worksheet
Grade 12 Chemistry worksheet on mass-mole conversions, molar mass calculations, and Avogadro's number.
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Stoichiometry: Mass and Moles
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Read each question carefully and provide your answers in the space provided. Show all your work for calculations.
1. The is the mass of one mole of a substance.
2. Avogadro's number is approximately .
3. A mole is a unit of .
1. Which of the following represents the smallest number of particles?
1.0 g of H₂O
1.0 mol of O₂
6.022 x 10²³ atoms of He
10.0 g of CO₂
2. What is the molar mass of sulfuric acid (H₂SO₄)? (Atomic masses: H=1.01 g/mol, S=32.07 g/mol, O=16.00 g/mol)
50.08 g/mol
98.09 g/mol
100.00 g/mol
130.15 g/mol
1. How many moles are in 25.0 grams of water (H₂O)?
2. What is the mass of 0.75 moles of carbon dioxide (CO₂)?
3. How many molecules are present in 5.0 moles of oxygen gas (O₂)?
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 mass in grams.
True
False
The diagram below illustrates the relationship between mass, moles, and particles. Use this diagram to answer the following question.
How many hydrogen atoms are in 1.0 mole of water (H₂O)?