Atomic Mass Of Barium


Molar mass of BaSO4 = 233.3896 g/mol

Convert grams Barium Sulfate to moles or moles Barium Sulfate to grams


››More information on molar mass and molecular weight. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Electronegativity according to Pauling. 3.5 at 20°C.

Molecular weight calculation:
137.327 + 32.065 + 15.9994*4

Symbol# of AtomsBariumBa137.327158.840%

Note that all formulas are case-sensitive.Did you mean to find the molecular weight of one of these similar formulas?

In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.

Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.

Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.

Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.

Atomic Mass Of Barium

The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.

A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.

Element Barium - Ba

Comprehensive data on the chemical element Barium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Barium. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

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Overview of Barium

  • Atomic Number: 56
  • Group: 2
  • Period: 6
  • Series: Alkali Earth Metals

Barium's Name in Other Languages

  • Latin: Baryum
  • Czech: Baryum
  • Croatian: Barij
  • French: Baryum
  • German: Barium - s
  • Italian: Bario
  • Norwegian: Barium
  • Portuguese: Bário
  • Russian: Барий
  • Spanish: Bario
  • Swedish: Barium

Atomic Structure of Barium

  • Atomic Radius: 2.78Å
  • Atomic Volume: 39.24cm3/mol
  • Covalent Radius: 1.98Å
  • Cross Section (Thermal Neutron Capture)σa/barns: 1.3
  • Crystal Structure: Cubic body centered
  • Electron Configuration:
    1s2 2s2p6 3s2p6d10 4s2p6d10 5s2p6 6s2
  • Electrons per Energy Level: 2,8,18,18,8,2
    Shell Model
  • Ionic Radius: 1.35Å
  • Filling Orbital: 6s2
  • Number of Electrons (with no charge): 56
  • Number of Neutrons (most common/stable nuclide): 81
  • Number of Protons: 56
  • Oxidation States: 2
  • Valence Electrons: 6s2
    Electron Dot Model

Chemical Properties of Barium

  • Electrochemical Equivalent: 2.5621g/amp-hr
  • Electron Work Function: 2.7eV
  • Electronegativity: 0.89 (Pauling); 0.97 (Allrod Rochow)
  • Heat of Fusion: 7.75kJ/mol
  • Incompatibilities:
  • Ionization Potential
    • First: 5.212
    • Second: 10.004
  • Valence Electron Potential (-eV): 21.3

Physical Properties of Barium

  • Atomic Mass Average: 137.327
  • Boiling Point: 2171K 1898°C 3448°F
  • Coefficient of lineal thermal expansion/K-1: 18.1E-6
  • Conductivity
    Electrical: 0.03 106/cm Ω
    Thermal: 0.184 W/cmK
  • Density: 3.59g/cc @ 300K
  • Description:
    Soft heavy silver colored metal.
  • Elastic Modulus:
    • Bulk: 9.6/GPa
    • Rigidity: 4.86/GPa
    • Youngs: 12.8/GPa
  • Enthalpy of Atomization: 175.7 kJ/mole @ 25°C
  • Enthalpy of Fusion: 7.66 kJ/mole
  • Enthalpy of Vaporization: 140 kJ/mole
  • Flammablity Class:
  • Freezing Point:see melting point
  • Hardness Scale
    • Mohs: 1.25
  • Heat of Vaporization: 142kJ/mol
  • Melting Point: 1002K 729°C 1344°F
  • Molar Volume: 38.21 cm3/mole
  • Physical State (at 20°C & 1atm): Solid
  • Specific Heat: 0.204J/gK
  • Vapor Pressure = [email protected]°C

Barium Element Mass

Regulatory / Health

  • CAS Number
    • 7440-39-3
  • RTECS: CQ8370000
  • NFPA 704
    • Health: 2
    • Fire: 2
    • Reactivity:
    • Special Hazard:
  • OSHAPermissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSHRecommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3: 0.068
    • Bone/p.p.m: 3-70
    • Liver/p.p.m: 0.04-1.2
    • Muscle/p.p.m: 0.09
    • Daily Dietary Intake: 0.6-1.7 mg
    • Total Mass In Avg. 70kg human: 22 mg

Who / Where / When / How

  • Discoverer: Sir Humphrey Davy
  • Discovery Location: London England
  • Discovery Year: 1808
  • Name Origin:
    Greek: barys (heavy or dense).
  • Abundance of Barium:
    • Earth's Crust/p.p.m.: 500
    • Seawater/p.p.m.:
      • Atlantic Suface: 0.0047
      • Atlantic Deep: 0.0093
      • Pacific Surface: 0.0047
      • Pacific Deep: 0.02
    • Atmosphere/p.p.m.: N/A
    • Sun (Relative to H=1E12): 123
  • Sources of Barium:
    Found in barytine (BaSO4) and witherite (BaCO3),never found in pure form due to its reactivity. Total annual world production estimated around 6,000,000 tons. Main mining areas are UK, Italy, Czech Republic, USA and Germany. Total world reserves estimated to be around 450,000,000 tons.
  • Uses of Barium:
    Used in sparkplugs, vacuum tubes, fireworks, fluorescent lamps. Insoluble barium sulfate is used for body imaging.
  • Additional Notes:
    Must be stored under kerosene to remain pure. Soluble barium salts are highly toxic.

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A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

Atomic Mass Of Barium Sulfate

Related Resources

  • Anatomy of the Atom
    Answers many questions regarding the structure of atoms.
  • Molarity, Molality and Normality
    Introduces stoichiometry and explains the differences between molarity, molality and normality.
  • Molar Mass Calculations and Javascript Calculator
    Molar mass calculations are explained and there is a JavaScript calculator to aid calculations.
  • Chemical Database
    This database focuses on the most common chemical compounds used in the home and industry.

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Atomic Mass Of Barium Chlorate

Kenneth Barbalace. Periodic Table of Elements - Barium - Ba. 1995 - 2021. Accessed on-line: 4/24/2021

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