Free Printable Empirical Formula

1.

A compound of carbon and hydrogen contains 85.7 %of carbon and 14.3 %

of hydrogen by mass. Deduce the empirical formula of this hydrocarbon. {H = l, C = 12)

a)

C₂H₂

b)

CH₂

c)

CH

d)

CH₄

2.

A compound has the empirical formula CH₂Br. Its relative molecular mass is 188. Deduce the molecular formula of this compound. (Br == 80, C = 12. H = l)

a)

C₂H₄Br₂

b)

C₁H₂Br₂

c)

C₁H₂Br

d)

C₁H₂Br₂

3.

the empirical formulae for hydrazine, N₂H₄

a)

N₁H₂

b)

NH

c)

NH₂

d)

N₂H₂

4.

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

a)

Molecular Formula

b)

Chemical Formula

c)

Empirical Formula

d)

Distance Formula

5.

Which of the following is a correct example of an empirical formula?

a)

$C_6H_{12}O_6$

b)

$C_2H_4O_2$

c)

$CH_2O$

d)

$C_3H_6O_3$

6.

Which of the following is not an empirical formula?

a)

$CH_4$

b)

$C_2H_6$

c)

$C_3H_8$

d)

$C_4H_{10}$

7.

A compound has an empirical formula of $NO_2$ and a molecular weight of 92 g/mol. What is its molecular formula?

a)

$NO_2$

b)

$N_2O_4$

c)

$N_3O_6$

d)

$N_4O_8$

8.

If the empirical formula of a compound is $CH_2$ and its molecular weight is 56 g/mol, what is the molecular formula?

a)

$C_2H_4$

b)

$C_3H_6$

c)

$C_4H_8$

d)

$C_5H_{10}$

9.

If a compound has an empirical formula of $C_2H_5$ and a molecular weight of 58 g/mol, what is its molecular formula?

a)

$C_2H_5$

b)

$C_3H_8$

c)

$C_4H_{10}$

d)

$C_5H_{12}$

10.

Which of the following is considered an empirical formula?

a)

CH₃COOH

b)

C₆H₁₂O₆

c)

H₂O

11.

Which pair has the same empirical formula?

a)

NaCrO₄ and Na₂Cr₂O₇

b)

C₂H₄O₂ and C₆H₁₂O₆

c)

C₃H₆O₃and C₂H₆O₂

d)

CH₄ and C₂H₆

12.

What is the empirical formula for C₃H₈

a)

CH

b)

C₃H₈

c)

C₆H₁₆

d)

CH_2.7

13.

Which one is an empirical formula?

a)

H₂O₂

b)

C₂H₆O₁₂

c)

CaCl₂

d)

N₂O₈

14.

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

a)

SO

b)

SO2

c)

SO3

d)

SO4

15.

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

a)

NaPO2

b)

Na2PO3

c)

Na3PO4

d)

NaPO4

16.

Which of these is NOT an empirical formula?

a)

CH2

b)

C2H5

c)

C6H4

d)

C3H7

e)

C5H17

17.

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

a)

Mg₄N₃

b)

MgN₂

c)

Mg₃N₂

d)

MgN

18.

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

a)

K₂SO₄

b)

K₈SO₁₆

c)

K₈S₄O₈

d)

K₈S₄O₁₆

19.

A compound contains 40% sulfur and 60% oxygen by mass. What is the empirical formula of the compound?

a)

$SO$

b)

$SO_2$

c)

$SO_3$

d)

$S_2O_3$

20.

Which of the following is an empirical formula?

a)

$C_6H_{12}O_6$

b)

$C_2H_4O_2$

c)

$CH_2O$

d)

$C_3H_6O_3$

21.

A compound has an empirical formula of $CH_2$ and a molecular weight of 84 g/mol. What is its molecular formula?

a)

$C_2H_4$

b)

$C_3H_6$

c)

$C_4H_8$

d)

$C_6H_{12}$

22.

Which of the following pairs of compounds have the same empirical formula?

a)

$C_2H_4O_2$ and $C_6H_{12}O_6$

b)

$C_3H_6O_3$ and $C_2H_4O_2$

c)

$C_2H_6$ and $C_4H_{10}$

d)

$C_5H_{10}$ and $C_6H_{12}$

23.

A compound is found to contain 36.5% sodium, 25.4% sulfur, and 38.1% oxygen by mass. What is the empirical formula of the compound?

a)

$NaSO_3$

b)

$Na_2SO_4$

c)

$Na_2S_2O_3$

d)

$Na_2SO_3$

24.

What is the empirical formula of a compound that contains 92.3% carbon and 7.7% hydrogen by mass?

a)

$CH$

b)

$CH_2$

c)

$C_2H_4$

d)

$C_3H_6$

25.

A compound has an empirical formula of $NO_2$ and a molecular weight of 92 g/mol. What is its molecular formula?

a)

$NO_2$

b)

$N_2O_4$

c)

$N_3O_6$

d)

$N_4O_8$

Empirical Formula

Total questions: 25

Worksheet time: 25mins

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