3. Chemical Reactions

Mass Percent

객관식
Morphine has the molecular formula C17H19NO3. What is the mass percent of oxygen in morphine?
170
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객관식
What is the mass percent of carbon in carbon monoxide (CO)?
144
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객관식
A 70.0-g iron nail combines with 30.0 g of oxygen to form rust. What is the total mass of the iron nail plus the rust that forms?
1650
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미해결 질문
An oxide of iron has the formula Fe₃O₄. What mass percent of iron does it contain
1223
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객관식
The following data were collected when analyzing a compound used in dentistry as a cement to repair teeth:

50.82% Zn;16.04% P;33.14% O

What is the empirical formula of the compound?
1674
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객관식
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?
957
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미해결 질문
What is the mass % of carbon in dimethylsulfoxide (C₂H₆SO) rounded to three significant figures?
1490
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객관식
What is the mass percent of water in Ca(NO3)2 · 4 H2O? Provide your answer to two decimal places.
123
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객관식
A 20.0 mL sample of a 15.5% (m/v) KBr solution is taken. What mass of KBr (in grams) is present in this sample?
126
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객관식
What is the mass percent of phosphorus in Zn3(PO4)2?
104
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객관식
Codeine has the molecular formula C17H19NO3. What is the mass percent of carbon (C) in codeine?
139
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미해결 질문
Calculate the percentage by mass of lead in Pb(NO₃)₂.
1913
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객관식
Which one of the following compounds has the smallest mass percent of fluorine (F)?
128
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미해결 질문
What is the mass percentage of c in caffeine, C₈H₁₀N₄O₂? Provide an answer to two decimal places.
1169
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객관식
What is the mass percent of oxygen in C2H6O (ethanol)?
126
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