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? (C = 12, H = 1, O = 16)
A compound contains 27.3% carbon and 72.7% oxygen by mass. What is its empirical formula? (C = 12, O = 16)
A compound contains 36.5% sodium, 25.4% sulfur, and 38.1% oxygen by mass. What is its empirical formula? (Na = 23, S = 32, O = 16)
A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula? (C = 12, H = 1, O = 16)
A compound contains 40% sulfur and 60% oxygen by mass. What is its empirical formula? (S = 32, O = 16)
A compound contains 53.3% oxygen and 46.7% silicon by mass. What is its empirical formula? (Si = 28, O = 16)
A compound contains 54.5% carbon, 9.1% hydrogen, and 36.4% oxygen by mass. What is its empirical formula? (C = 12, H = 1, O = 16)
A compound contains 85.7% carbon and 14.3% hydrogen by mass. What is its empirical formula? (Atomic masses: C = 12, H = 1)
Which of the following best describes an empirical formula? (1) The simplest whole-number ratio of atoms in a compound (2) The actual number of atoms in a molecule (3) The mass ratio of elements in a compound (4) The arrangement of atoms in a molecule
Which of the following is a possible empirical formula? (1) C2H4 (2) CH2 (3) C3H6 (4) C4H8
Which of the following is NOT an empirical formula? (1) H2O (2) C6H12O6 (3) CH2O (4) NH3
Which of the following is the correct empirical formula for a compound with 52.2% carbon, 13.0% hydrogen, and 34.8% oxygen by mass? (C = 12, H = 1, O = 16) (1) C2H6O (2) C3H8O (3) C4H10O (4) C2H6O2
Fill in the blank: The empirical formula of acetic acid (C2H4O2) is __________.
Fill in the blank: The empirical formula of benzene (C6H6) is __________.
Fill in the blank: The empirical formula of butane (C4H10) is __________.
Fill in the blank: The empirical formula of cyclohexane (C6H12) is __________.
True or False: The empirical formula and molecular formula of a compound are always the same.
True or False: The empirical formula of a compound can be determined from its percent composition.
True or False: The empirical formula of a compound can never be the same as its molecular formula.
True or False: The empirical formula of a compound is always the simplest ratio of atoms present.
