Structure 1.4.4—The empirical formula of a compound gives the simplest ratio of atoms of each element present in that compound. The molecular formula gives the actual number of atoms of each element present in a molecule. Interconvert the percentage composition by mass and the empirical formula. Determine the molecular formula of a compound from its empirical formula and molar mass.

Directly related questions

• 22N.1A.SL.TZ0.4:

  Which is a possible empirical formula for a substance with M_r = 42?

  
  A.  CH

  B.  CH₂

  C.  C₃H₆

  D.  C₃H₈

• 22N.1A.SL.TZ0.4:

  Which is a possible empirical formula for a substance with M_r = 42?

  
  A.  CH

  B.  CH₂

  C.  C₃H₆

  D.  C₃H₈

• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 19M.1A.SL.TZ1.3: What is the empirical formula of a hydrocarbon with 75 % carbon and 25 % hydrogen by mass? A....
• 20N.1A.SL.TZ0.3:

  Which of these molecular formulae are also empirical formulae?

  1.  ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$
  2.  ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$
  3.  ${\mathrm{C}}_5{\mathrm{H}}_{12}$

  A.  I and II only

  B.  I and III only
  

  C.  II and III only
  

  D.  I, II and III

• 20N.1A.SL.TZ0.3:

  Which of these molecular formulae are also empirical formulae?

  1.  ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$
  2.  ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$
  3.  ${\mathrm{C}}_5{\mathrm{H}}_{12}$

  A.  I and II only

  B.  I and III only
  

  C.  II and III only
  

  D.  I, II and III

• 20N.1A.SL.TZ0.3:

  Which of these molecular formulae are also empirical formulae?

  1.  ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$
  2.  ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$
  3.  ${\mathrm{C}}_5{\mathrm{H}}_{12}$

  A.  I and II only

  B.  I and III only
  

  C.  II and III only
  

  D.  I, II and III

• 20N.1A.SL.TZ0.3:

  Which of these molecular formulae are also empirical formulae?

  1.  ${\mathrm{C}}_2{\mathrm{H}}_6\mathrm{O}$
  2.  ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$
  3.  ${\mathrm{C}}_5{\mathrm{H}}_{12}$

  A.  I and II only

  B.  I and III only
  

  C.  II and III only
  

  D.  I, II and III

• 21M.1A.SL.TZ1.2: A sample of a compound contains approximately 24.0 g C, 3.0 g H, and 1.6 g O. What is the...
• 21M.1A.SL.TZ1.2: A sample of a compound contains approximately 24.0 g C, 3.0 g H, and 1.6 g O. What is the...
• 21M.1A.SL.TZ1.2: A sample of a compound contains approximately 24.0 g C, 3.0 g H, and 1.6 g O. What is the...
• 21M.1A.SL.TZ1.2: A sample of a compound contains approximately 24.0 g C, 3.0 g H, and 1.6 g O. What is the...
• 21M.1A.SL.TZ2.3: Which molecule has the same empirical formula as molecular formula? A.  CH3COOH B.  C2H5OH C. ...
• 21M.1A.SL.TZ2.3: Which molecule has the same empirical formula as molecular formula? A.  CH3COOH B.  C2H5OH C. ...
• 21M.1A.SL.TZ2.3: Which molecule has the same empirical formula as molecular formula? A.  CH3COOH B.  C2H5OH C. ...
• 21M.1A.SL.TZ2.3: Which molecule has the same empirical formula as molecular formula? A.  CH3COOH B.  C2H5OH C. ...
• 21M.2.SL.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
• 21M.2.SL.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
• 21M.2.SL.TZ1.a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
• 21M.2.SL.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
• 21M.2.SL.TZ1.3a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
• 21M.2.SL.TZ1.a: Deduce the ratio of Fe2+:Fe3+ in Fe3O4.
• 22M.1A.SL.TZ1.3: What is the molecular formula of a compound with an empirical formula of CHO2 and a...
• 22M.1A.SL.TZ1.3: What is the molecular formula of a compound with an empirical formula of CHO2 and a...
• 22M.1A.SL.TZ1.3: What is the molecular formula of a compound with an empirical formula of CHO2 and a...
• 22M.1A.SL.TZ1.3: What is the molecular formula of a compound with an empirical formula of CHO2 and a...
• 22M.1A.SL.TZ1.4: 8.8 g of an oxide of nitrogen contains 3.2 g of oxygen. What is the empirical formula of the...
• 22M.1A.SL.TZ1.4: 8.8 g of an oxide of nitrogen contains 3.2 g of oxygen. What is the empirical formula of the...
• 22M.1A.SL.TZ1.4: 8.8 g of an oxide of nitrogen contains 3.2 g of oxygen. What is the empirical formula of the...
• 22M.1A.SL.TZ1.4: 8.8 g of an oxide of nitrogen contains 3.2 g of oxygen. What is the empirical formula of the...
• 22M.1A.SL.TZ2.2: 30 g of an organic compound produces 44 g CO2 and 18 g H2O as the only combustion products. Which...
• 22M.1A.SL.TZ2.2: 30 g of an organic compound produces 44 g CO2 and 18 g H2O as the only combustion products. Which...
• 22M.1A.SL.TZ2.2: 30 g of an organic compound produces 44 g CO2 and 18 g H2O as the only combustion products. Which...
• 22M.1A.SL.TZ2.2: 30 g of an organic compound produces 44 g CO2 and 18 g H2O as the only combustion products. Which...
• 22M.2.SL.TZ2.1d: Describe two observations that indicate the reaction of lithium with water is exothermic.
• 22M.2.SL.TZ2.1d: Describe two observations that indicate the reaction of lithium with water is exothermic.
• 22M.2.SL.TZ2.d: Describe two observations that indicate the reaction of lithium with water is exothermic.
• 22M.2.SL.TZ2.1d: Describe two observations that indicate the reaction of lithium with water is exothermic.
• 22M.2.SL.TZ2.1d: Describe two observations that indicate the reaction of lithium with water is exothermic.
• 22M.2.SL.TZ2.d: Describe two observations that indicate the reaction of lithium with water is exothermic.