Free Printable Empirical and Molecular Formula Practice Test

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Empirical and Molecular Formula Practice Test

Total questions: 33

Worksheet time: 44mins

Name

Class

Date

Which pair has the same empirical formula?

NaCrO₄ and Na₂Cr₂O₇

C₂H₄O₂ and C₆H₁₂O₆

C₃H₆O₃and C₂H₆O₂

CH₄ and C₂H₆

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

Mg₄N₃

MgN₂

Mg₃N₂

MgN

A formula with the lowest whole # ratio of elements in a compound is called

Molecular Formula

Chemical Formula

Empirical Formula

Distance Formula

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

What is the molecular formula for a compound with the empirical formula: K₂SO₄and a molecular mass of 696g.

K₂SO₄

K₈SO₁₆

K₈S₄O₈

K₈S₄O₁₆

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

NaPO₂

Na₂PO₃

Na₃PO₄

NaPO₄

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

ionic formula

covalent formula

empirical formula

molecular formula

In which compound is the percent composition by mass of Cl equal to 42%?

HClO (gram formula mass = 52 g/mol)

HClO₂ (gram formula mass = 68 g/mol)

HClO₃ (gram formula mass = 84 g/mol)

HClO₄ (gram formula mass = 100 g/mol)

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

SO2

SO3

SO4

10.

What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?

C₃H₈

CH₄

C₂H₂

C₄H₁₀

11.

When calculating the Empirical formula the mole ratio is given as follows:

H₁O_3.5

_{What will the empirical formula be?}

H₁O_3.5

HO_3.5

HO₄

H₂O₇

12.

Find the percent composition of Cu₂S?

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

13.

Which of the following is considered an empirical formula?

CH₃COOH

C₆H₁₂O₆

H₂O

14.

Define empirical formula.

formula with the lowest whole number ratios of the elements in a compound.

formula for any compound that includes a Nobel gas.

formula for calculating the limiting reagent of a reaction

formula that shows how many of each type of atom are present in a single molecule.

15.

Define molecular formula.

formula with the lowest whole number ratios of the elements in a compound.

formula for any compound that includes a Nobel gas.

formula for calculating the limiting reagent of a reaction

formula that shows how many of each type of atom are present in a single molecule.

16.

Is the following formula molecular or empirical?

CH₃

molecular

empirical

both

17.

Is the following formula molecular or empirical?

H₂O₂

molecular

empirical

both

18.

Is the following formula molecular or empirical?

C₆H₁₂O₆

molecular

empirical

both

19.

Is the following formula molecular or empirical?

H₂O

molecular

empirical

both

20.

Write the empirical formula for: C₂H₄

C₁H₄

C₀H₂

CH₂

21.

Write the empirical formula for: C₆H₆

C₀H₀

C₀H₂

C₃H₃

22.

Write the empirical formula for: C₉H₁₈O₃

C₂H₉O₁

C₃H₆O

C₆H₁₅O

C₃H₃O

23.

What elements can be found in Aspirin? C₉H₈O₄

carbon

hydrogen

oxygen

helium

24.

How many oxygen atoms are in a compound of "liquid paper" (i.e. white out)? TiO₂

one

two

three

none

25.

How many atoms of carbon are in C₆H₁₂O₆?

26.

Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)

H₃SO₄

HSO₄

H₄S₃O

H₂O

27.

How many atoms are there total in H₂SO₄

28.

How many elements are in C₆H₁₂O₆?

29.

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

30.

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

CH₂O

C₂H₄O₂

C₄H₈O₄

C₆H₁₂O₆

31.

What is the molecular formula of a compound with an empirical formula of C₂OH₄ and a molar mass of 88 grams per mole?

C₂O₄H₈

C₈O₂H₄

C₄O₂H₈

C₄O₈H₂

32.

Epinephrine (adrenaline) is a hormone secreted into the bloodstream in times of stress. It contains 59.0% C, 7.15% H, 26.20%O, 7.65%N and has a molar mass of 183 g/mol. What is its molecular formula?

C₉H₁₃NO₃

C₅H₁₁N₃O₂

C₈H₁₂NO₂

C₇H₉N₂O

33.

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

C₂H₃O₂

CH₂O

C₂H₄O₂

C₃H₈O₃

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Empirical and Molecular Formula Practice Test

Total questions: 33

Worksheet time: 44mins

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