Calcium Oxide

CaO

IUPAC: Calcium oxide

CAS: 1305-78-8

Overview

Calcium oxide (quicklime) is a white caustic substance produced by heating limestone. It reacts exothermically with water to form slaked lime.

Composition

Element	Symbol	Atoms	Atomic Mass
Oxygen	O	1	15.9990
Calcium	Ca	1	40.0780

Elemental Composition

Oxygen ×1

28.5%

Calcium ×1

71.5%

Uses

• Cement production
• Steel manufacturing
• Water treatment
• Soil stabilization

Fun Facts

✦ Quicklime was used in ancient warfare — Roman ships catapulted it at enemy vessels

Safety

⚠ Corrosive
⚠ Causes severe burns
⚠ Exothermic reaction with water

Structure

SMILES

O=[Ca]

Properties

Type: oxide
State: solid
Molar Mass: 56.08 g/mol
Density: 3.3400 g/cm³
Melting Point: 2613.0 °C
Boiling Point: 2850.0 °C
Solubility: Reacts

Molecular Descriptors

Exact Mass: 55.9575
TPSA: 17.1 Å²
H-Bond Donors: 0
H-Bond Acceptors: 1
Rotatable Bonds: 0
Heavy Atoms: 2
Complexity: 2.0

Related Compounds

Aluminum Oxide

Al₂O₃

Antimony Trioxide

Sb₂O₃

Barium Oxide

BaO

Beryllium Oxide

BeO

Bismuth(III) Oxide

Bi₂O₃

Boron Trioxide

B₂O₃

Cadmium Oxide

CdO

Carbon Dioxide

CO₂

Carbon Monoxide

Cerium(IV) Oxide

CeO₂

Frequently Asked Questions

What is Calcium Oxide?

Calcium Oxide (CaO) is a oxide compound with the IUPAC name Calcium oxide.

What is the molecular weight of Calcium Oxide?

Calcium Oxide has a molar mass of 56.08 g/mol.

What state is Calcium Oxide at room temperature?

Calcium Oxide is a solid at room temperature.

Is Calcium Oxide organic or inorganic?

Calcium Oxide is classified as an inorganic compound.

What elements make up Calcium Oxide?

Calcium Oxide (CaO) is composed of Oxygen (O), Calcium (Ca).