Empirical and Molecular Formula Practice Test

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of atoms of each element in a compound.

Front

What is a molecular formula?

Back

A molecular formula shows the actual number of atoms of each element in a molecule of a compound.

Front

How do you determine the empirical formula from percent composition?

Back

Convert the percentages to grams, then to moles, and simplify the mole ratio to the smallest whole numbers.

Front

Which of the following is an example of an empirical formula: C6H12O6 or CH2O?

Back

CH2O is an empirical formula.

Front

What is the empirical formula of C4H8?

Back

The empirical formula is C2H4.

Front

How many atoms of hydrogen are in C3H6O3?

Back

There are 6 hydrogen atoms.

Tags

NGSS.MS-PS1-1

Front

Is CH3 an empirical formula or a molecular formula?

Back

CH3 can be both an empirical and a molecular formula.

Front

What is the empirical formula for a compound with the molecular formula C8H16?

Back

The empirical formula is C4H8.

Front

If a compound has an empirical formula of NaPO2, what could its molecular formula be?

Back

Possible molecular formulas include Na2P2O4 or Na3P3O6.

Front

What is the empirical formula of a compound with 40% carbon, 6.67% hydrogen, and 53.33% oxygen?

Back

The empirical formula is CH2O.