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Unit 7: Stoichiometry Skill Check

Quiz by Amanda Stepanick

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5 questions
Show answers
  • Q1

    A student tried to solve the following problem by selecting the tile as shown. What, if anything, did the student do wrong?

    Question Image

    There is nothing wrong. The problem is ready to be solved.

    The student chose the correct tile, but needs to flip the tile to make the units cancel.

    The student chose the correct tile, but needs to add a second tile to finish the solution.

    The student chose the wrong tile to solve the problem.

    30s
  • Q2

    Based on the tiles shown, how many moles of oxygen gas (O2) are needed to produce 36.04 grams of water (H2O) when reacting with excess ethane in the equation 2C2H6 + 7O2 → 4CO2 + 6H2O?

    Question Image

    2.333 moles of oxygen (O2)

    19.02 moles of oxygen (O2)

    84 moles of oxygen (O2)

    1.714 moles of oxygen (O2)

    30s
  • Q3

    Which tile should be used to solve the following problem?

    Question Image

    Tile A

    Tile D

    Tile C

    Tile B

    30s
  • Q4

    Based on the equation below, how many moles of aluminum sulfate (Al2(SO4)3) will be produced from the reaction of 5.8 moles of aluminum hydroxide (Al(OH)3) and excess sulfuric acid (H2SO4)?

    2Al(OH)3 + 3H2SO4 → Al2(SO4)3 + 6H2O

    5.8 moles of aluminum sulfate

    3.9moles of aluminum sulfate

    11.6 moles of aluminum sulfate

    2.9 moles of aluminum sulfate

    30s
  • Q5

    Based on the equation below, how many grams of nitrogen gas (N2) will be produced from the decomposition of one mole of sodium azide (NaN3)?

    Use a molar mass of 28.0 grams per mole for nitrogen gas (N2).

    2NaN3 → 2Na + 3N2

    56.0 grams

    42.0 grams

    18.7 grams

    28.0 grams

    30s

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