Multiple Choice
In a hydrate of CoCl2, experimental analysis determined that there are 6 moles of water per formula unit. What is the correct formula for this hydrate?
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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
Which of the following methods is used to determine the amount of each reactant consumed in a chemical reaction?
A
By estimating based on the reactants' molecular weights alone
B
By observing the physical state of the products
C
By measuring the color change of the reactants
D
By using the balanced chemical equation to calculate mole ratios between reactants
Verified step by step guidance1
Understand that the key to determining the amount of each reactant consumed in a chemical reaction lies in the quantitative relationship between reactants and products, which is provided by the balanced chemical equation.
Recall that a balanced chemical equation shows the exact mole ratios of reactants and products involved in the reaction, ensuring the law of conservation of mass is satisfied.
Use the balanced chemical equation to identify the mole ratio between the reactants. This ratio tells you how many moles of one reactant react with a certain number of moles of another reactant.
Apply stoichiometry by converting the given amount of one reactant (usually in grams or moles) into moles, then use the mole ratio from the balanced equation to calculate the moles of the other reactant consumed.
Convert the moles of the reactant back into grams if needed, using the molar mass, to find the amount of reactant consumed in the reaction.
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