Solutions to Stoichiometric Calculations

Link to Exercises and Solutions

Exercise: Balance the following chemical reactions

Exercise: Balancing Chemical Reactions

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Solutions

Formula weight of a molecule

The summation of the atomic weights of all atoms In the chemical formula of the molecule.
Note: Formula weight calculated by this way is also known as "Molecular Formula Weight" or "Molecular Weight"

Question: Calculate the formula weight of HClO₄
¹_1.01H

¹⁷_35.5Cl

⁸₁₆O

Solution: Molecular Weight = (1 × 1) + (1 × 35.5) + (4 × 16) = 100.5 amu

Example: Calculate the % N in NH₄NO₃

⁸₁₆O

¹_1.01H

⁷₁₄N

% N = (((# of atoms of the element) × (atomic weight of the element))/ (Formula weight of the compound))) × 100 =
= (2 × 14) / ((1 × 14) + (4 × 1) + (1 × 14) + (3 × 16)) = 35; which means that NH₄NO₃ contains 35% of N.

Exercise: Calculate the formula weight of the following molecules

Exercise on Calculating the Formula Weight of Molecules

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Exercise: Mole & Molar Mass

Exercise: Mole and Molar Mass

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Solutions

Exercise: Number of Atoms and Moles

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Solutions

Exercise: Finding Mass and Number of Moles

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Solutions

Exercise: Mass Produced from Burning Butane

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Solutions

Exercise: Finding the Limiting Reactant

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Solutions

Exercise: Finding Theoretical Yield

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Solutions

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