24-25 Chemical Compounds Quiz

The smallest whole-number ratio of atoms of each element, combined in the simplest unit of a chemical compound is known as a(n)

• molecular formula

• formula unit

• empirical formula

• molecule

What is the empirical formula for benzene, C₆H₆?

• CH

• C₂H₂

• C₃H₃

• C₆H₆

What other information do you need in order to determine the molecular formula from the empirical formula of a compound?

• the number of moles of the compound

• the formula mass of the compound

• the oxidation numbers of all the elements in the compound

• the smallest whole-number mole ratio of the atoms in the compound

What is the empirical formula for a compound that contains 1.18 mol Na, 1.18 mol N, and 3.53 mol O?

• NaNO

• NaNO₂

• Na₂NO

• NaNO₃

What is the empirical formula for a compound that contains 83.01% K and 16.98% O by mass?

• KO

• KO₂

• K₂O

• K₅O

What is the empirical formula of a compound that contains 79.86% I and 20.14% O by mass?

• IO

• I₂O₂

• IO₂

• I₄O

What is the empirical formula for lactic acid, which has a molecular formula of C₃H₆O₃?

• CH₂O

• C₂H₃O₂

• C₃H₆

• CHO

NaCl is

• a molecular formula only.

• an empirical formula only.

• both an empirical formula and a chemical formula.

• both a molecular formula and an empirical formula.

What is the empirical formula mass of the compound C₂H₄?

• 13.02 g

• 14.03 g

• 26.04 g

• 28.05 g

What is the molecular formula for the compound with an empirical formula of NO₂ and a formula mass of 92.02 u?

• NO₂

• N₂O₄

• N₄O₈

• NO