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U8.2 Study Guide (Percent Composition)

Quiz by Aaron Holley

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14 questions
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  • Q1

    Part of a whole expressed in hundredths is referred to as ____.

    per capita

    percent

    per milllion

    per 1000

    30s
  • Q2

    Which of the following best describes the ways that we can calculate percent composition for a substance?

    only from the chemical formula

    neither the chemical formula nor experimental data

    from the chemical formula OR from experimental data

    only from experimental data

    30s
  • Q3

    What is the percentage of Ca in CaCO3?

    40.04%

    12.00%

    47.96%

    57.19%

    300s
  • Q4

    What is the percentage of sodium in sodium chlorate?

    21.60%

    33.31%

    39.34%

    18.78%

    300s
  • Q5

    What is the percentage of strontium in strontium nitrate?

    9.63%

    45.36%

    41.40%

    90.37%

    300s
  • Q6

    What is the percentage of copper in copper(II) phosphate?

    33.63%

    30.85%

    54.69%

    50.09%

    300s
  • Q7

    A compound is made up of 8.604 g nitrogen, 7.376 g C, and 24.016 g K.  What is the percentage of potassium in the sample of this compound?

    18.44%

    73.62%

    21.51%

    60.04%

    300s
  • Q8

    You are working with a 37.50 g sample of a chromium-containing compound.  Determine the percent composition in the sample if 19.01 g of the sample is composed of oxygen, 4.76 g is carbon, and the remainder is chromium.  Type your answer to two decimal places.  Do not put the percent sign.

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    300s
  • Q9

    What is the percentage of oxygen in CaCO3?

    12.00%

    57.19%

    47.96%

    40.04%

    300s
  • Q10

    What is the percentage of phosphorus in copper(II) phosphate?

    50.09%

    33.63%

    30.85%

    16.27%

    300s
  • Q11

    Sodium chloride is 39.34% sodium and 60.66% chlorine, by mass.  How much sodium is in a 125.8 g sample of sodium chloride?  Write your answer to two decimal places, and be sure to include units.

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    300s
  • Q12

    Sodium chloride is 39.34% sodium and 60.66% chlorine, by mass.  How much chlorine is in a 125.8 g sample of sodium chloride?  Write your answer to two decimal places, and be sure to include units.

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    300s
  • Q13

    Magnesium phosphate is 27.74% magnesium, 48.69% oxygen, and the remainder is phosphorus, by mass.  How much magnesium is in a 221.3 g sample of magnesium phosphate?  Write your answer to two decimal places, and be sure to include units.

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    300s
  • Q14

    Magnesium phosphate is 27.74% magnesium, 48.69% oxygen, and the remainder is phosphorus, by mass.  How much phosphorus is in a 221.3 g sample of magnesium phosphate?  Write your answer to two decimal places, and be sure to include units.

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    300s

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