Empirical and Molecular Formulas

How many Carbons "C" are in C₁₈H₃₄O₃

• 18

• 34

• 3

• 37

Tags

NGSS.MS-PS1-1

What is the best definition for subscript?
 

• The big number that tells you the number of molecules.

• The atomic number

• The little number that tells the number of atoms for each element.

Tags

NGSS.MS-PS1-1

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

Molecular Formula = C₂F₆

Choose the correct empirical formula.

• CF

• C₂F₆

• C₃F

• CF₃

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

Empirical Formula = CF₂

Molecular formula mass = 192 g/mol

Molecular Formula = ?

• C₄F₈

• C₈F₄

• C₃F₆

• C₂F₄

Tags

NGSS.HS-PS1-7

Molecular Formula = Si₂F₆

Choose the correct empirical formula.

• SiF

• Si₂F₆

• SiF₃

• Si₄F₁₂

How would you calculate the molar mass for C₄H₆?

• 12.0111 + 1.00794

• 4(12.0111) + 6(1.00794)

• 2(12.0111) + 3(1.00794)

• 6(12.0111) + 4(1.00794)

The empirical formula of a substance is CH₂O. The molar mass is 180g/mol. What is the molecular formula?

• CH₂O

• C₃H₆O₃

• C₆H₁₂O₆

• C₁₂H₆O₁₂

What is the empirical formula of K₂SO₄?

• K₂SO₄

• KSO₂

• K₂SO₂

• KSO₈