Empirical & Molecular Formulas

Find the percent composition of N₂S₂.

• N: 69.6%  S: 30.4%
• N:36% S: 75.6%
• N: 96.6% S: 3.4%
• N: 30.4% S: 69.6%

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 696g.

• K₂SO₄ 
• K₈SO₁₆
• K₈S₄O₈ 
• K₈S₄O₁₆ 

Whats the empirical formula of a molecule containing 40.0 % C, 6.7% H, and 53.3% oxygen?

• CHO

• CH₂O

• CH₃0

• C₂HO₂

What is the empirical formula for the following molecular formula: C₆H₁₄

• C₆H₁₄
• C₃H₇
• CH₂
• CH₃

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 120?

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆

What is the molecular formula of a compound with an empirical formula of C₂OH₄ and a molecular mass of 88 grams per mole?

• C₂O₄H₈

• C₈O₂H₄

• C₄O₂H₈

• C₄O₈H₂

How many moles are in 125 g of propane, C₃H₈.

• 5500

• 16.0

• 2.8

• 3,872

What is the empirical formula for the following molecular formula: C₅H₁₂

• C₅H₁₂
• CH₃
• CH₂
• C_2.5H₆

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

What is the molecular formula for a compound with the empirical formula: CaCl₂ and a molecular mass of 220g.

• Ca₂Cl₄

• Ca₃Cl₆

• Ca₃Cl₉

• Ca₃Cl₅