Empirical vs Molecular

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.

• is the simplest whole-number ratio of moles of elements in the compound.

Which of the following could be a molecular formula with the empirical formula of CH₂O?

• CH₂O₂

• CHO

• C₃H₅O₃

• C₂H₄O₂

Tags

NGSS.MS-PS1-1

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

Which of these is NOT an empirical formula?

• CH2

• C2H5

• C6H4

• C3H7

• C5H17

A formula that shows the smallest whole-number mole ratio of the elements of a compound, and may or may not be the same as the actual molecular formula.

• Empirical Formula

• Molecular Formula

• Stoichiometry

• Chemical Reaction

What is the main difference between an empirical formula and a molecular formula?

• An empirical formula shows the exact number of atoms of each element in a compound, while a molecular formula shows the simplest whole-number ratio.

• An empirical formula shows the simplest whole-number ratio of atoms in a compound, while a molecular formula shows the exact number of atoms of each element.

• An empirical formula is used for ionic compounds, while a molecular formula is used for covalent compounds.

• An empirical formula is always larger than a molecular formula.

• All of the above

Tags

NGSS.MS-PS1-1

Which of the following statements is true about empirical formulas?

• They can be used to determine the exact structure of a molecule.

• They are always the same as the molecular formula.

• They represent the simplest whole-number ratio of elements in a compound.

• They are used to calculate the molar mass of a compound.