Empirical and Molecular Formula Calculations
Chemistry ⇒ Stoichiometry and Chemical Calculations
Empirical and Molecular Formula Calculations starts at 10 and continues till grade 12.
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A compound contains 21.7% carbon, 9.6% hydrogen, and 68.7% oxygen by mass. What is its empirical formula?
A compound contains 36.5% sodium, 25.4% sulfur, and 38.1% oxygen by mass. What is its empirical formula?
A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?
A compound contains 52.2% carbon, 13.0% hydrogen, and 34.8% oxygen by mass. What is its empirical formula?
A compound contains 54.5% carbon, 9.1% hydrogen, and 36.4% oxygen by mass. If its molar mass is 88 g/mol, what is its molecular formula?
A compound contains 85.7% carbon and 14.3% hydrogen by mass. What is its empirical formula?
A compound has a molar mass of 180 g/mol and an empirical formula of CH₂O. What is its molecular formula?
A compound has an empirical formula of C₂H₅ and a molar mass of 58 g/mol. What is its molecular formula?
Which of the following best describes the difference between empirical and molecular formulas?
(1) Empirical formula shows the actual number of atoms in a molecule, molecular formula shows the simplest ratio.
(2) Empirical formula shows the simplest ratio, molecular formula shows the actual number of atoms in a molecule.
(3) Both formulas always show the same information.
(4) Empirical formula is only used for ionic compounds.
Which of the following is an empirical formula?
(1) C₆H₆
(2) C₂H₄
(3) CH
(4) C₄H₁₀
Which of the following is NOT an empirical formula?
(1) CH₂
(2) C₂H₄
(3) NH₃
(4) H₂O
Which of the following is the correct empirical formula for a compound with 27.3% carbon and 72.7% oxygen by mass?
(1) CO
(2) CO₂
(3) C₂O₄
(4) C₃O₆
Fill in the blank: The empirical formula of C₂H₄O₂ is _______.
Fill in the blank: The empirical formula of C₃H₆ is _______.
Fill in the blank: The empirical formula of C₄H₁₀ is _______.
Fill in the blank: The empirical formula of C₅H₁₀ is _______.
True or False: The empirical formula of a compound can be the same as its molecular formula.
True or False: The empirical formula of a compound can never have fractional subscripts.
True or False: The empirical formula of a compound with a molecular formula of P₄O₁₀ is P₂O₅.
True or False: The empirical formula of C₆H₁₂O₆ is CH₂O.
