Chemistry: Matter and Change

Section 4: Empirical and Molecular Formulas

Self Check Quizzes

1
What relationship is described by the formula below? (mass of the element/mass of the compound) x 100
A)percent composition
B)mole ratio
C)Avogadro's number
D)empirical formula
2
How can the actual molecular formula be determined?
A)from the empirical formula alone
B)from the molar mass alone
C)from the molar mass divided by the mass of the empirical formula
D)from the molar mass multiplied by the mass of the empirical formula
3
Analysis of a covalent compound showed that it contained 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for this compound?
A)CH
B)CH2
C)CH3
D)C2H3
4
A sample of liquid contains 0.059% hydrogen and 0.94% oxygen. What is the empirical formula?

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A)H2O
B)HO
C)H2O2
D)HO2
5
The empirical formula for a sample of liquid is HO. The molecular weight is 34.0 grams/mole. What is the molecular formula

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A)H2O
B)HO
C)H2O2
D)HO2
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