3. Chemical Reactions

Mass Percent

Open Question
What is the percent composition of Mg in the compound Mg₃(PO₄)₂?
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Open Question
What is the percent by mass of chlorine in NaCl? Use mc002-1.jpg. 35.45% 39.34% 60.66% 70.90%
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Open Question
What is the mass percentage of C in CH3CH3? Provide an answer to two decimal places.
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Open Question
An oxide of iron has the formula Fe₃O₄. What mass percent of iron does it contain
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Open Question
What is the mass percentage of c in caffeine, C₈H₁₀N₄O₂? Provide an answer to two decimal places.
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Open Question
What is the alcohol content of a 20-oz beer that contains 5% alcohol?
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Open Question
Which element is in the greatest amount in what is referred to as a starter fertilizer?
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Multiple Choice
A sample of white gold contains 18.0 g gold, 3.0 g silver, 2.0 g cobalt, and 1.0 g platinum. What is the mass percent of platinum in the sample?
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Multiple Choice
A solution is prepared by dissolving 98.6 g of NaCl in enough water to form 875 mL of solution. Calculate the mass percent of NaCl in the solution if the density of the solution is 1.06 g/mL.
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Multiple Choice
An aqueous KNO3 solution is made using 71.6 g of KNO3 diluted to a total solution volume of 1.80 L. Assuming a density of 1.05 g/mL for the solution, what is the mass percent of KNO3 in the solution?
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Multiple Choice
What is the percent by mass of sodium chloride in a 1.40 M NaCl solution with a density of 1.07 g/mL?
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Multiple Choice
What is the mass percentage of carbon in dimethyl sulfoxide (C2H6SO), rounded to three significant figures?
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Multiple Choice
What is the mass percentage of carbon (C) in caffeine, C₈H₁₀N₄O₂? Provide an answer to two decimal places.
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Multiple Choice
What is the mass percent (m/m%) of a solution if 20 grams of solute is dissolved in 80 grams of solvent?
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Multiple Choice
What is the mass percent composition of carbon in carbon dioxide (CO2)?
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