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WorksheetsMolar Mass & Percent Composition
Total questions: 10
Worksheet time: 12mins
Which of the following compounds contains the most oxygen by mass?
H2O
H2O2
H3O+
none because they have equal percentage composition
Which between carbon monoxide and carbon dioxide has a greater carbon content by mass?
carbon monoxide
carbon dioxide
none because they have equal percentage composition
cannot be determined
The molar mass of this compound is computed to be 74.14g/mol.
Identify this alcohol.
ethanol (C2H6O)
propanol (C3H8O)
butanol (C4H10O)
pentanol (C5H12O)
An unlabeled bottle of alcohol produces the following composition:
C = 59.94% H = 13.44% O = 26.62%.
Which alcohol was analyzed?
ethanol (C2H6O)
propanol (C3H8O)
butanol (C4H10O)
pentanol (C5H12O)
The A compound with a molar mass of 92.16g/mol is known to have the same empirical formula as this alcohol. Which alcohol is being described?
ethanol (C2H6O)
propanol (C3H8O)
butanol (C4H10O)
pentanol (C5H12O)
Prof. X wanted the alcohol that has the highest oxygen content. Which alcohol should you give him?
ethanol (C2H6O)
propanol (C3H8O)
butanol (C4H10O)
pentanol (C5H12O)
Arrange the elements of this common herbicide, C₉H₉ClO₃, according to increasing percent composition.
Cl<O<H<C
H<O<Cl<C
H<Cl<O<C
Cl<H<O<C
The mass of each element per 100 mass unit of compound is called __________.
percent composition
molar mass
mole ratio
molecular formula
Glycerol has a chemical formula of CxH8O3 and has a molar mass of 92.09g/mol.
How many carbons does glycerol have?
1
2
3
4
Glycerol has a chemical formula of CxH8O3 and has a molar mass of 92.09g/mol.
What percent of glycerol is carbon?
66.66%
39.10%
21.42%
3.25%
