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Chemical Composition and Formula Relationships Quiz

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#1

What is the chemical formula for water?

H2O
Explanation

Water consists of two hydrogen atoms and one oxygen atom.

#2

What is the chemical symbol for iron?

Fe
Explanation

Fe is the chemical symbol for iron.

#3

What is the formula for the compound commonly known as table salt?

NaCl
Explanation

The formula for table salt is NaCl.

#4

What is the chemical formula for methane?

CH4
Explanation

Methane's chemical formula is CH4.

#5

Which of the following is NOT a diatomic molecule?

H2O
Explanation

H2O is not a diatomic molecule.

#6

What is the molar mass of carbon dioxide (CO2)?

44.01 g/mol
Explanation

The molar mass of CO2 is 44.01 grams per mole.

#7

How many oxygen atoms are in one molecule of sulfuric acid (H2SO4)?

4
Explanation

There are four oxygen atoms in one molecule of sulfuric acid (H2SO4).

#8

What is the molar mass of calcium carbonate (CaCO3)?

100.09 g/mol
Explanation

The molar mass of CaCO3 is 100.09 grams per mole.

#9

How many hydrogen atoms are in one molecule of glucose (C6H12O6)?

12
Explanation

There are twelve hydrogen atoms in one molecule of glucose (C6H12O6).

#10

What is the molar mass of ammonium sulfate ((NH4)2SO4)?

132.14 g/mol
Explanation

The molar mass of (NH4)2SO4 is 132.14 grams per mole.

#11

What is the empirical formula of a compound composed of 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

CH2O
Explanation

The empirical formula of the compound is CH2O.

#12

What is the molecular formula of a compound with an empirical formula of CH2O and a molar mass of approximately 180.16 g/mol?

C6H12O6
Explanation

The molecular formula is C6H12O6.

#13

What is the empirical formula of a compound composed of 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

CH2O
Explanation

The empirical formula of the compound is CH2O.

#14

What is the molecular formula of a compound with an empirical formula of CH and a molar mass of approximately 78.11 g/mol?

C3H3
Explanation

The molecular formula is C3H3.

#15

What is the empirical formula of a compound composed of 26.7% nitrogen and 73.3% oxygen by mass?

NO2
Explanation

The empirical formula of the compound is NO2.

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