Chemical Formulas and 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

What is the empirical formula for benzene, C₆H6?

• CH

• C₂H₂

• C3H3

• C6H6

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

• the number of moles of the cmpound

• the formula mass of the compound

• the oxidation numbers of 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 83.01% K and 16.98% O by mass?

• K₂0

• K50

• KO

• KO2

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

• 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

• N408

• NO