Molecular Formulae

Discussion: Empirical and Molecular Formula

Some text here about the topic of discussion

Multiple Choice

What is the empirical formula for C₄H₆?

• CH

• CH₃

• C₂H₃

• C₄H₆

​C₂H₄

Multiple Choice

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇

• C₂H₄O₂ and C₆H₁₂O₆

• C₃H₆O₃ and C₂H₆O₂

• CH₄ and C₂H₆

Multiple Choice

A sample contains 36.95 g of mercury (Hg) and 13.05 g of chlorine (Cl). What is the empirical formula for this compound? Hint: find the mole ratio between the 2 elements.

• HgCl₂

• Hg₃Cl

• Hg₁₇Cl₃₆

• HgCl

​A sample contains 36.95 g of mercury (Hg) and 13.05 g of chlorine (Cl). What is the empirical formula for this compound?

Multiple Choice

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

• Mg₄N₃

• MgN₂

• Mg₃N₂ 

• MgN

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

Multiple Choice

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

• SO

• SO2

• SO3

• SO4

Multiple Choice

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

• CH₂O

• C₂H₄O₂

• C₄H₈O₄

• C₆H₁₂O₆

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

Multiple Choice

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.13% C, 8.76% H, and 52.12% O. What is the molecular formula for glycerol?

• C₂H₃O₂

• CH₂O

• C₂H₄O₂

• C₃H₈O₃

​Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.13% C, 8.76% H, and 52.12% O. What is the molecular formula for glycerol?