DCI 2.1 - Stoichiometry

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DCI 2.1 - Stoichiometry

• An atom of R weighs 1 mass unit (mu), G weighs 3
  mass units (mu) and B weighs 2 mass units (mu).
• i) the mass of BG would be ____mu
• ii) the mass of RG would be ____mu

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Compare the results of Tables II and III.

• What is the relationship between the amounts of
  substances in each of the two tables?
• How is the set of numbers for the initial
  amounts related to the balanced chemical
  equation?

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Compare the results of Tables II and III.

• How is the set of numbers for the final amounts
  related to the balanced chemical equation?
• How is the set of numbers for the change
  amounts related to the balanced chemical
  equation?
• Do the DCI on page 25 in the activities manual.

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1. Consider the following chemical equation
describing the reaction between sulfur dioxide
and oxygen. 2SO2 (g) O2(g) ?
2SO3(g)

• Given the following container as representing the
  final condition
• Which of the containers (--gt) best represents the
  initial conditions?

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1. Consider the following chemical equation
describing the reaction between sulfur dioxide
and oxygen. 2SO2 (g) O2(g) ?
2SO3(g)

• Given the following container as representing the
  final condition
• Which of the containers (--gt) best represents the
  initial conditions?

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2. Which of the following changes can be
described by the balanced chemical
equation, A2(g) 3B2(g) ? 2AB3(g)

• A) I only
• B) II only
• C) I and III
• D) II and III
• E) I, II and III

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3. Consider the following chemical equation
describing the reaction between sulfur dioxide
and oxygen. 2SO2 (g) O2(g) ?
2SO3(g)

• Given the following container as representing the
  final condition
• Which of the containers (--gt) best represents the
  initial conditions?

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3. Which of the chemical equations best
describes the reaction represented by the
containers below? Consider the container label
initial condition as the reactants before any
reaction has occurred, and the container labeled
final condition as the same container after the
reaction has reached completion.

• A) 4A2(g) 7B2(g) ? 4AB3(g)
• B) 4A2(g) 7B2(g) ? 4AB3(g) 1B2(g) 2A2(g)
• C) A2(g) 3B2(g) ? 2AB3(g)
• D) 4A2(g) 6B2(g) ? 4AB3(g)
• E) A2(g) B2(g) ? AB3(g)

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4. Consider the hypothetical reaction2G R --gt
G2RIf G has a mass 3 mu and R 2 muWhat is
in excess and what is the limiting reagent if 6
mu of R and 6 mu of G are mixed?

• A. R is the excess reagent and G is the limiting
  reagent
• B. G is the excess reagent and R is the limiting
  reagent
• C. both R and G are excess reagents
• D. both R and G are limiting reagents