Stoichiometric Calculations: Exercises and Solutions
Exercise: Balance the following chemical reactions:
Exercise on Balancing Chemical Reactions
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Solution to the Exercise on Balancing Chemical Reactions
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
11.01H
1735.5Cl
816O
Solution: Molecular Weight = (1 × 1) + (1 × 35.5) + (4 × 16) = 100.5 amu
Example: Calculate the % N in NH4NO3
816O
11.01H
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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Solution to the Exercise on Calculating the Formula Weight of Molecules
Exercise: Mole & Molar Mass
Exercise on Mole & Molar Mass
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Solution to the Exercise on Mole & Molar Mass
Exercise on Number of Atoms and Moles
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Solution to the Exercise on Number of Atoms and Moles
Exercise on Finding Mass and Number of Moles
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Solution to the Exercise on Finding Mass and Number of Moles
Exercise on Mass Produced from Burning Butane
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Solution to the Exercise on Mass Produced from Burning Butane
Exercise on Finding the Limiting Reactant
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Solution to the Exercise on Finding the Limiting Reactant
Exercise on Finding Theoretical Yield
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Solution to the Exercise on Finding Theoretical Yield
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Date of last modification: 2022