Test on Empirical and Molecular Formula

A compound has the empirical formula CH. The molecular mass is found to be somewhere between 75 - 80 g/mol. What is the molecular formula of the compound?

• C₂H₂

• C₃H₃

• C₅H₅

• C₆H₆

A compound has the molecular formula C₁₂H₂₄O₆. What is the empirical formula of this compound?

• CHO

• C₂H₄O

• C₆H₁₂O

• CH₂O

A compound has the molar mass of 170.0 g/mol and an empirical formula of SiF₃. The compounds molecular formula is

• SiF₃

• Si₂F₆

• Si₅F₁₅

• Si₄F₁₂

What is the empirical formula of the following molecular formula:  C₃H₆

• C₃H₆
• CH₂
• C₂H₄
• CH₃

Which one is empirical?

• H₂O₂
• C₂H₆O₁₂
• CaCl₂
• N₂O₈

What is the empirical formula for a compound containing the following ratio:
3Na:1P:4O

• NaPO₄
• Na₃P₄O
• Na₃PO₄
• NaPO

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

• NO
• N₂O₃
• N₂O₄
• N₂O₅

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

• Cu₃O₈
• CuO₄
• Cu₂O
• Cu₄O₁₀

Tags

NGSS.HS-PS1-7

What is the empirical formula of the following molecular formula:  C₃H₆

• C₃H₆
• CH₂
• C₂H₄
• CH₃

What is the empirical formula if you have 35.98% aluminum and 64.02% sulfur?

• AlS

• Al₂S

• AlS₂

• Al₂S₃