Chemistry: Chapter 12 Study Guide – Flashcards
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The calculation of quantities in chemical reactions.
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stoichiometry
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The quantities to consider in a chemical reaction?
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atoms, molecules, moles, mass, and volume
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On the left side of a chemical equation, you have the?
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reactants
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On the right side of a chemical equation, you have the?
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products
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In every chemical reaction, these two things are conserved.
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atoms and mass
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In a majority of chemical reactions, these three things are NOT conserved.
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moles, molecules, and volume
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The 3 in 3H2 refers to the number of?
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molecules
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How many atoms are in N2 + 3H2?
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8
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What is the ratio of molecules in N2 (g) + 3H2 (g) --> 2NH3 (g)
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1:3:2
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How many atoms are in 3H2?
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6
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How many moles in 2NH3?
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2
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How many molecules in 3H2?
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3
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How many moles in N2?
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1
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Mass of N2?
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28g
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Volume of 2NH3?
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44.8 L
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How many molecules are in one mole of something?
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6.02x10^23 molecules
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What is the molar mass of NH3?
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17.0g
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What is the molar mass of H2?
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2.0g
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Where do you go to find the molar mass of an element?
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periodic table
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What is the STP value?
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22.4L
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This limits or determines the amount of product that can be formed in a reaction.
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limiting reagent
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The reactant that is not completely used up in a reaction.
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excess reagent
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The maximum amount of product that could be formed from given amounts of reactants.
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theoretical yield
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The amount of product that actually forms when the reaction is carried out in the laboratory.
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actual yield
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The ratio of the actual yield to the theoretical yield expressed as a percent.
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percent yield
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What is the formula for percent yield?
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actual yield/theoretical yield x 100%
