Identify Empirical and Molecular Formulas

Si₂F₆

Choose the correct empirical formula...

• SiF

• Si₂F₆

• SiF₃

• Si₆F₂

A formula with the lowest whole # ratio of elements in a compound is called

• Molecular Formula
• Chemical Formula
• Empirical Formula 
• Distance Formula

A 4.175 gram sample of a certain hydrate of copper (II) sulfate, CuSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 3.120 grams. What is the formula of the hydrate?

• CuSO4•H2O

• CuSO4•3H2O

• CuSO4•6H2O

• CuSO4•4H2O

A 5.018 gram sample of a certain hydrate of magnesium sulfate, MgSO4•xH2O, is heated until all the water is driven off. The resulting anhydrous compound weighs 2.449 grams. What is the formula of the hydrate?

• MgSO4•9H2O

• MgSO4•8H2O

• MgSO4•7H2O

• MgSO4•6H2O

Which pair has the same empirical formula?

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

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

Which of the following is the correct empirical formula for C₄H₁₀

• C₂H₅
• CH_2.5
• C₈H₂₀
• C₄H₁₀

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

• C₂H₃O₂
• CH₂O
• C₂H₄O₂
• C₃H₈O₃

Which of the following represents the empirical formula for C₆H₁₂O₆?

• CH₂O

• CHO

• C₂H₆O

• CHO₂

What is the empirical formula for C₄H₆?

• CH

• CH₃

• C₂H₃

• C₄H₆