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Worksheets

EMPIRICAL AND MOLECULAR FORMULAE

Total questions: 10

Worksheet time: 5mins

Name
Class
Date
1.

What is the empirical formula for the following molecular formula: C6H14

a)

C6H14

b)

C3H7

c)

CH2

d)

CH3

2.

What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180?

a)

CH2O

b)

C2H4O2

c)

C4H8O4

d)

C6H12O6

3.

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

a)

C2O4H8

b)

C8O2H4

c)

C4O2H8

d)

C4O8H2

4.

What is the empirical formula for the following molecular formula: C5H12

a)

C5H12

b)

CH3

c)

CH2

d)

C2.5H6

5.

The molecular formula gives

a)

simplest ratio of atoms

b)

actual whole number ratio of atoms

c)

whole number ratio of atoms

d)

natural number ratio of atoms

6.

The empirical formula for a hydrocarbon is found to be CH2. In a separate experiment, the molar mass is determined to be approximately 112 g mol-1. The number of hydrogens in the molecular formula of the hydrocarbon is therefore

a)

8

b)

12

c)

16

d)

20

7.

Among the following the compounds having different empirical and molecular formula are

a)

H2SO3

b)

HNO3

c)

H2CO3

d)

CH3COOH

8.

Succinic acid has a simple formula of C2H3O2 and a molecular weight of 118 grams/mol. What is the molecular formula of succinic acid?

Atomic weights: C = 12.0, H = 1.01, O = 16.0

a)

C8H12O8

b)

C2H3O2

c)

C3H6O3

d)

C4H6O4

9.

Butene has a simple formula of CH2 and a molecular weight of 56.0 g/mol. What is the molecular formula of butene?

Atomic weights: C = 12.0; H = 1.0

a)

C2H4

b)

C3H4

c)

C6H8

d)

C4H8

10.

The empirical formula for Caffeine (C8H10N4O2) is:

a)

C5H5N2O

b)

C4H5N2O

c)

C4H5NO

d)

C4H5NO2