Grade 9 Chemistry Calculations Worksheet
A worksheet for Grade 9 students covering fundamental chemistry calculations including molar mass, stoichiometry, and limiting reactants.
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Grade 9 Chemistry Calculations
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Read each question carefully and show all your work. Use the provided periodic table information for atomic masses when needed. Round all final answers to two decimal places.
1. Calculate the molar mass of the following compounds:
a) Water (H₂O)
b) Carbon Dioxide (CO₂)
c) Glucose (C₆H₁₂O₆)
2. Complete the following mole conversions:
a) How many moles are in 25.0 grams of NaCl?
b) What is the mass in grams of 3.5 moles of H₂SO₄?
c) How many molecules are in 0.75 moles of O₂?
3. Indicate whether the following statements are True (T) or False (F).
a) The coefficients in a balanced chemical equation represent the mole ratio of reactants and products.
True
False
b) A limiting reactant is the reactant that is completely consumed in a chemical reaction.
True
False
4. Given the balanced chemical equation: 2H₂ + O₂ → 2H₂O
If you start with 4.0 moles of H₂ and excess O₂, how many moles of H₂O can be produced?
Partial Periodic Table for reference:
Approximate Atomic Masses (g/mol): H=1.01, C=12.01, O=16.00, Na=22.99, Cl=35.45, S=32.07