Molecular formulas
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Molecular Formulas. A molecule is a neutral group of atoms united by covalent bonds. A substance that is made of molecules is called a molecular substance . To describe the composition of a molecular compound , chemists often use a molecular

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Molecular Formulas

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Molecular Formulas


A molecule is a neutral group of atoms united by

covalent bonds. A substance that is made of

molecules is called a molecular substance. To

describe the composition of a molecular

compound, chemists often use a molecular

formula. A molecular formula tells you how

many atoms are in a single molecule of the

compound.


What is a subscript?

If a molecule contains more than one atom of a

particular element, this quantity is indicated

using a subscript after the chemical symbol.

NH3

Subscript


GLUCOSE

EXAMPLE: The molecular formula for glucose

(a simple type of sugar):

C6H12O6

6 atoms of carbon 12 atoms of hydrogen 6 atoms of oxygen


Molecular Structure for Glucose


SAMPLE PROBLEMS:

1. What elements are in the following compound: Lithium acetate (LiC2H3O2)?

a. Lithium

b. Carbonc. Hydrogen

d. Oxygen


LiC2H3O2

2. How many atoms of each element are in the compound above?

Li = 1

C = 2

H = 3

O = 2


3. How many total # of atoms are in the following compound: Ammonium phosphate

((NH4)3PO4)?

N = 3

H = 12

P = 1

O = 4


4. Write the chemical formula for the following compound.

1 atom of gold and 3 atoms of chlorine

AuCl3

Au

Cl

Cl

Cl


Practice Problems

Part A

5.

2 atoms of hydrogen, 1 atom of sulfur, and 4 atoms of oxygen

H2SO4


Part B

1.

ZnS

Zinc Sulfur


Part C

1.

Glucose: C6H12O6

Carbon = 6

Hydrogen = 12

Oxygen = 6


Number of Atoms in a Formula

18.

Mg(C2H3O2)2

Mg = 1

C = 4 15 atoms

H = 6

O = 4


Great Combinations

  • Phosphorus pentoxide

O

O

P

O

P

O

O


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