Multiple Choice
When 2.50 mol of Al and 3.00 mol of Cl2 combine in the reaction 2Al(s) + 3Cl2(g) → 2AlCl3(s), how many moles of the excess reactant remain at the end of the reaction?
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3. Chemical Reactions
Stoichiometry
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
All stoichiometry calculations involve which important step?
A
Balancing the chemical equation by adding more reactants
B
Converting quantities to moles
C
Measuring the temperature of the reaction mixture
D
Calculating the pH of the solution
Verified step by step guidance1
Understand that stoichiometry is the quantitative relationship between reactants and products in a chemical reaction.
Recognize that all stoichiometry calculations require working with moles because chemical equations relate amounts in moles, not in grams or other units.
Identify that the first important step in stoichiometry is to convert all given quantities (mass, volume, particles) into moles using appropriate conversion factors such as molar mass or molar volume.
Once quantities are in moles, use the balanced chemical equation to relate moles of one substance to moles of another via mole ratios.
After using mole ratios, convert moles back to desired units if needed (grams, liters, particles) to complete the stoichiometry calculation.
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