What Is The Molar Mass Of Cr3 Aso4 2

What is the molar mass of cr3 aso4 2 – Delving into the enigmatic world of chemistry, we embark on a quest to unravel the mysteries surrounding the molar mass of chromium(III) arsenate sulfate hydrate, a compound with intriguing properties and diverse applications. Prepare to be captivated as we delve into the intricacies of molecular weight, composition, structure, and the fascinating realm where chemistry meets practicality.

Introduction

Molar mass, often referred to as molecular weight, is a fundamental concept in chemistry. It represents the mass of one mole of a substance, which is defined as the amount of that substance that contains exactly 6.02214076 × 10 ²³elementary entities.

These entities can be atoms, molecules, ions, or electrons, depending on the nature of the substance. The molar mass of a substance is expressed in grams per mole (g/mol).

The chemical formula of chromium(III) arsenate sulfate hydrate is Cr ₃(AsO ₄) ₂·xH ₂O, where x represents the number of water molecules associated with each formula unit of the compound. This compound is a coordination complex, in which the chromium(III) ion (Cr ³⁺) is coordinated to two arsenate ions (AsO ₄^3-) and two sulfate ions (SO ₄^2-). The water molecules are present as ligands, which are molecules or ions that donate electron pairs to the metal ion to form a coordinate bond.

Determining Molar Mass: What Is The Molar Mass Of Cr3 Aso4 2

The molar mass of a compound is the mass of one mole of that compound. It is expressed in grams per mole (g/mol). The molecular weight of a compound is the sum of the atomic weights of all the atoms in the compound.

The molar mass and molecular weight of a compound are numerically equal.

Calculating the Molar Mass of Chromium(III) Arsenate Sulfate Hydrate

To calculate the molar mass of chromium(III) arsenate sulfate hydrate, we need to know the atomic weights of chromium, arsenic, sulfur, oxygen, and hydrogen. The atomic weights of these elements can be found in the periodic table.

The formula for chromium(III) arsenate sulfate hydrate is Cr ₃(AsO ₄) ₂SO ₄·xH ₂O. The atomic weights of chromium, arsenic, sulfur, oxygen, and hydrogen are:

Chromium: 52.00 g/mol
Arsenic: 74.92 g/mol
Sulfur: 32.07 g/mol
Oxygen: 16.00 g/mol
Hydrogen: 1.01 g/mol

The molar mass of chromium(III) arsenate sulfate hydrate is calculated as follows:

Multiply the atomic weight of each element by the number of atoms of that element in the formula.
Add the products of step 1 together.
The sum of step 2 is the molar mass of the compound.

For chromium(III) arsenate sulfate hydrate, the molar mass is calculated as follows:

3 × 52.00 g/mol = 156.00 g/mol
2 × 74.92 g/mol = 149.84 g/mol
1 × 32.07 g/mol = 32.07 g/mol
11 × 16.00 g/mol = 176.00 g/mol
18 × 1.01 g/mol = 18.18 g/mol
156.00 g/mol + 149.84 g/mol + 32.07 g/mol + 176.00 g/mol + 18.18 g/mol = 532.09 g/mol

Therefore, the molar mass of chromium(III) arsenate sulfate hydrate is 532.09 g/mol.

Composition and Structure

Chromium(III) arsenate sulfate hydrate is composed of the elements chromium (Cr), arsenic (As), sulfur (S), oxygen (O), and hydrogen (H).

The molecular structure of the compound can be described as a complex ion, [Cr(H2O)6]3+, surrounded by sulfate ions (SO42-) and arsenate ions (AsO43-). The [Cr(H2O)6]3+ ion has an octahedral geometry, with six water molecules coordinated to the chromium ion.

Elements Present, What is the molar mass of cr3 aso4 2

Chromium (Cr)
Arsenic (As)
Sulfur (S)
Oxygen (O)
Hydrogen (H)

Molecular Structure and Geometry

Complex ion: [Cr(H2O)6]3+
Octahedral geometry
Surrounded by sulfate ions (SO42-) and arsenate ions (AsO43-)

Properties and Applications

Chromium(III) arsenate sulfate hydrate, Cr3(AsO4)2SO4.xH2O, is a crystalline solid that exists as a tetrahydrate (xH2O = 4). It is a heavy, water-soluble compound that forms blue-green to violet crystals. The compound is highly toxic due to the presence of both chromium and arsenic.

Physical Properties

Color

Blue-green to violet

Odor

Odorless

Density

3.27 g/cm³

Melting point

Decomposes before melting

Solubility

Soluble in water

Chemical Properties

Chromium(III) arsenate sulfate hydrate is a stable compound that does not decompose easily.
It is a strong oxidizing agent and can react with reducing agents to form chromium(II) compounds.
It is also a weak acid and can react with bases to form chromium(III) hydroxide.

Applications

Chromium(III) arsenate sulfate hydrate is used in a variety of applications, including:

As a wood preservative
As a mordant in dyeing
As a catalyst in the production of other chemicals
As a pigment in paints and ceramics

Quick FAQs

What is the significance of molar mass in chemistry?

Molar mass is a crucial parameter in chemistry as it represents the mass of one mole of a substance, providing insights into its molecular weight and composition.

How is the molar mass of chromium(III) arsenate sulfate hydrate calculated?

The molar mass is determined by summing the atomic masses of all atoms present in the compound’s formula, which for chromium(III) arsenate sulfate hydrate is Cr3(AsO4)2·xH2O.

What are the key properties of chromium(III) arsenate sulfate hydrate?

This compound exhibits a range of properties, including its solubility in water, its stability under ambient conditions, and its potential toxicity.