3. Chemical Reactions

Mass Percent

Open Question
Calculate the mass percent composition of lithium in Li₃PO₄.
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Multiple Choice
What is the percent by mass of sodium in NaCl? Choose the closest value.
Multiple Choice
What is the percent by mass of carbon in C_{10}H_{14}N_{2}?
Multiple Choice
An oxide of iron has the formula Fe_3O_4. What is the mass percent of iron in Fe_3O_4?
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Multiple Choice
Which element has a mass percent composition of 21.49% in borax (Na2B4O7·10H2O)?
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Multiple Choice
What is the percent by mass of carbon in acetone (C3H6O)?
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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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Multiple Choice
What is the mass percentage of carbon (C) in caffeine, C₈H₁₀N₄O₂? Provide an answer to two decimal places.
Open Question
What is the percent composition of Mg in the compound Mg₃(PO₄)₂?
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Open Question
A 500 gram iron ore sample was determined to contain 242 grams of iron. What is the mass percent of iron in the ore?
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Multiple Choice
What is the mass percentage of carbon in dimethyl sulfoxide (C2H6SO), rounded to three significant figures?
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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Open Question
What is the alcohol content of a 20-oz beer that contains 5% alcohol?
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Open Question
A 69.5 g sample of the compound X₃O₄ contains 19.2 g of oxygen atoms. What is the molar mass of element X?
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Open Question
What mass of a 4.00% NaOH solution by mass contains 15.0 g of NaOH?
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